First:
Area BFE
Second, there is so much public land in Utah where you CAN wheel to your hearts content
for free, not many people would be willing to pay $30 to go to an old quarry. Now if we end up getting more and more trails closed and land restricted, I bet more people would try and do something like Badlands. But ask the owners of BFE, they are not millionaires by any stretch, and I doubt anyone here in Utah would become one as things are right now by opening a private OHV park.
I knew the owners personally, they did become VERY very rich and now they host the TREK racing and KOH qualifiers at the park, not to mention monster truck weekends and music events ...
My main point being that the ideal place would be to have it closer to SLC than ~4hours away like St George and Moab so your close to the masses of people. You have to build an attraction because the demand is there and obviously being in UT and having no legitimate extreme offroad areas or parks close to such a big city is kinda bogus compared to the rest of the country.
While being close to the masses brings the money, yuppies and folks that want to pay a marginal price to have the facilities/amenities while playing in the sport your largely invested in. You would get a lot more people on a daily weekend attendance when you’re so close to the population.
I love BFE, but the is that's they are a Public/private area and do not mandate a charge to enter their property they just asks for voluntary donations (which is great, but a lot of people don't pay), nor do they have showers, RV hookups, an ATV/UTV pro shop, buggy shop, general store and their out in BFE Southern UT...my 2cent & feedback for thought.
Oh and the reason most ohv trails get closed is because they are public, not because they don't get used or do get used... legally you can shut down any public use due to litigations and legality from land use organizations including our own defunct government and private invested groups most likely classified to the common mas as “tree huggers”.