I like it.    Better yet, build it in a steep valley so the fats are on easy street getting there but have to climb steep hills to get out.  They get to the top and have to go right back to down to "reward" themselves for their effort.  Then they need to climb the hill again to get out.  It would be some sort of Sisyphean McDonalds, where they stone they roll up the hill is their own gunt.     Of course, in reality they'd just never leave.  At least we'd be rid of them.