I wouldn't worry about the 10 yr rule if you are basically respectable looking. I try to not pay for any camping but my guess is its common to be around $28.00 to $40.00
You can find ways to camp for free, then you find some that are little county, dept of ag etc that may be $5.00 or $10.00. Then there are some of that type that move up to $15.00 to $20.00
What's your plan? Are you into boondocking and able to generate your own power or do you need to plug in often? Just curious, not prying.