If a resort can balance their books on a season pass I suppose they will. You can control how much work needs to be done and you can control who is going out on your plowed and maintained areas. Some resorts may not be able to find enough people to work the winter season for unlimited use. Also, a resort can chose to manage the chaos and eliminate those that do not want to play be the rules.
Lots of snow across central and east central MN. Mille Lacs is battling some poor ice and slush this year. Unlimited roads and parking spots will probably not be in the plans for most resorts.
There are many other lakes in that region that have zero activity when you drive by. Deep snow and slush.