My kids learned to ski at Spirit Mountain, but to be honest, we haven't been back for 7-8 years, maybe more... not really sure why I guess. Partly because we can do a trip out west for a similar per day/per person cost I suppose. And on those terms, most everyone would opt for the mountains over an 800' hill.
With that said, my son is now at UMD, so chances are we'll hit Spirit Mtn at some point this winter. But the $65/day rate for MN skiing is a bit more than I care to spend in general... could be many others feel the same.
Edit to add: Spirit also seems to be one of the last in MN to open for some reason, year in and year out. Many years ago, pre-kids, pre-Internet, me and a buddy drove from the Twin Cities up to Spirit mid-week in mid-December only to find they were not open. Buck Hill, Wild Mountain, Afton and everyone else had already been open for a couple of weeks. We ended up driving back to Wild Mountain and skied there instead.