Have found that as mentioned above, many campgrounds only allow electric. Asked why at a few and it was to prevent ATV's from being ridden in the loops. Ban gas powered engines other than licensed vehicles and it took care of the problem they said.
Electric Carts will weigh more due to the batteries but is quieter and again, allowed about everywhere. If you have free electric hookups, your getting recharged free also.
Gas Carts are lighter and usually faster on unmodified carts but banned some places. Gas prices are never free and you need to haul gas cans if you extended stay anywhere for longer than the cart will go on it's tank of fuel.
Agreed $2000 seems to be the going price for the basic used cart and if you shop around, you can sometimes find on with the 2nd backward seat fold down flat bed for that price.