The OP is full of beans with his posted prices and what you get at a Michigan State Park CG. Below is the copied and pasted 2013 CG fees for all Michigan State Park CG's.
State Park and Recreation Areas
The following fees are currently in effect. State parks and recreation areas remain open year-round for day-use visitors, Ten campgrounds are open for the winter months During this time, prices are $16 a night for a semi-modern campsite and $12 a night for a rustic campsite. Three parks keep a heated restroom open in the winter: Rifle River ($23), Traverse City ($27), and Mitchell ($29).
Associated Camping Fees at State Park and Recreation Areas
Non-refundable reservation fee - $8
Cancellation fee - $10
Full Hook-Up Campsite - $33 per night
Full hook-up campsites feature direct sewer, water and electrical hook-ups with 20/30- or 50-amp service. Click on a campground below to find out more.
Hartwick Pines State Park
Holland State Park-Beach Campground
Wm. C. Sterling State Park
South Higgins Lake State Park
Premium Modern Campsite - $29-$28 per night
Premium campsites are in high demand typically because of site locations and feature 50-amp electric hookups, modern toilet buildings, showers, wheelchair-accessible sites and sanitation stations. In addition, some campgrounds have pull-through sites for larger vehicles. Click on a campground below to find out more.
$29.00 per night
Grand Haven State Park
P. J. Hoffmaster State Park
Holland State Park
Ludington State Park
William Mitchell State Park
North Higgins Lake State Park
Petoskey State Park
South Higgins Lake State Park
Young State Park
$28 per night
Aloha State Park
Muskegon State Park /Channel and Lake Michigan
Straits State Park
Modern Campsite - $27-$16 per night
Modern campsites feature electric hookups (amps will vary), modern toilet buildings, showers, wheelchair-accessible sites and sanitation stations. In addition, some campgrounds have pull-through sites for larger vehicles. Click on a campground below to find out more.
$27 per night
Algonac State Park-Riverfront Campground (50 amp)
Grand Haven State Park
P. J. Hoffmaster State Park
Holland State Park
Ludington State Park (30 amp)
Mears State Park
William Mitchell State Park
North Higgins Lake State Park
Petoskey State Park
Port Crescent State Park
Silver Lake State Park
South Higgins Lake State Park
Tawas Point State Park
Traverse City State Park
Warren Dunes (50 amp)
Wilderness State Park
Young State Park
$26 per night
Aloha State Park (30 amp )
Burt Lake State Park (50 amp)
F. J. McLain State Park
Muskegon State Park/Channel and Lake Michigan
Otsego Lake State Park
Straits State Park
$25 per night
Algonac State Park-Riverfront Campground (30 amp)
Fort Wilkins Historic State Park (50 amp)
Harrisville State Park (50-amp)
Hartwick Pines State Park
Hayes State Park
Porcupine Mountains Wilderness State Park - Union Bay Campground
Sleeper State Park (50 amp)
Warren Dunes State Park (30 amp)
$24 per night
Burt Lake State Park
Indian Lake State Park
Orchard Beach State Park
Pinckney Recreation Area-Bruin Lake
Waterloo Recreation Area(50 amp)
Yankee Springs Recreation Area
$23 per night
Bay City State Recreation Area (50 amp)
Brimley State Park (50 amp)
Fort Wilkins Historic State Park (30 amp)
Harrisville State Park
Holly Recreation Area(50 amp)
Interlochen State Park (50 amp)
Lakeport State Park
Metamora-Hadley Recreation Area
Rifle River State Recreation Area
Albert E. Sleeper State Park (30-amp electric service)
Tahquamenon Falls State Park (50 amp)
Van Buren State Park (50-amp electric service)
Van Riper State Park (50-amp electric service)
Warren Dunes State Park
$22 per night
Cheboygan State Park
P. H. Hoeft State Park (30 amp)
Indian Lake State Park (30-amp)
Proud Lake Recreation Area
Wm. C. Sterling State Park
Twin Lakes (50 amp)
Waterloo Recreation Area (30 amp)
Yankee Springs Recreation Area/Gun Lake
$21 per night
Bay City Recreation Area (30-amp)
Brimley State Park (30 amp)
Fort Custer (30 amp)
Holly Recreation Area (30 amp)
Interlochen State Park - Duck Lake ( 30-amp)
Albert E. Sleeper State Park
Taquamenon Falls State Park/Lower Falls and Rivermouth (30-amp)
Van Buren State Park
Van Riper State Park
Wells State Park
Wilson State Park
$20 per night
Brighton Recreation Area
Bewabic State Park (50 amp)
Onaway State Park
Twin Lakes State Park
$19 per night
Clear Lake State Park (30 amp)
Ionia Recreation Area (30 amp)
Seven Lake State Park
Sleepy Hollow State Park
Wells State Park
$18 per night
Algonac State Park-Wagon Wheel (30 amp)
Baraga State Park (30 amp)
Bewabic State Park( 30 amp)
Lake Gogebic State Park (30 amp)
Pontiac Lake Recreation Area
$16 per night
Muskallonge Lake State Park
Tahquamenon Falls State Park - Rivermouth (toilet/shower buildings, no electric hookups)
Semi-Modern Campsite
There are two distinct options in this classification. The first offers electrical service but no modern toilet/shower buildings. Vault toilets are available on location and water is available from a hand pump. The second option provides modern toilet and shower buildings but no electrical hookups.
$18 per night -- Features 50-amp electrical service but no toilet/shower buildings
Fayette Historic State Park
$16 per night --30-amp electrical service OR modern toilet/shower buildings.
Baraga State Park (toilet/shower buildings, no electrical hookups)
Bewabic State Park (toilet/shower buildings, no electrical hookups)
Fayette Historic State Park (electric hookups, vault toilets )
Holly Recreation Area (toilet/shower buildings, no electrical hookups)
Indian Lake State Park - West Shore (electric hookups, vault toilets)
Lake Hudson Recreation Area (electrical hookups, vault toilets)
Lake Gogebic State Park (toilet/shower buildings, no electric hookups)
Ludington-Jack Pine Hike-In (toilet/shower building available nearby, no electrical hookups)
Tahquamenon Falls State Park Rivermouth (toilet/shower buildings, no electric hookups)
Rustic Campsite - $10-$14 per night
Vault toilets and hand pump water. No showers or flush toilets.
$14 per night
Porcupine Mountains Wilderness State Park-Presque Isle
$12 per night
Brighton Recreation Area
Craig Lake State Park
Fisherman's Island State Park
Highland Recreation Area (dual-use campground - equestrian is $17/night)
Interlochen State Park - Green Lake
Leelanau State Park
Newago State Park
Pinckney Recreation Area
Rifle River Recreation Area
Tippy Dam Boating Access Site and Rustic Campground
Van Riper State Park
Warren Dunes State Park
Waterloo Recreation Area - Green Lake
Yankee Springs Recreation Area - Deep Lake
Equestrian Campground - $17 per night
Vault toilets, hand pumps and hitching posts for horses.
Brighton Recreation Area
Ionia Recreation Area
Ortonville Recreation Area
Waterloo Recreation Area
Highland Recreation Area
The Link!
http://www.michigan.gov/dnr/0,4570,7-153-10365-32926--,00.html
The campground site fees are exactly the same for anyone from any state including Michigan residents.
Nice try OP!