The White Gold Card can be a great deal. I've bought one most seasons for the last decade or so. If you live near Detroit, you get four days at the local molehills plus 6 to 7 days at the "better" resorts in Boyne Country. That works out to less than $20 per ski day. If you can swing a trip through the UP, you can drive the cost per day down even further. Even if you don't use all the punches, it only takes three days at Nubs and the Boynes to break even.
If you're new to Michigan skiing, it's a great way to check out all the options and decide which hill you like best. For myself, I've decided to stop buying it - I've got a pass at my favorite hill and I found that I was driving all over the place to ski at hills I didn't like as much because I'd already paid for a lift ticket.
So, two big thumbs up for the White Gold card. I've just outgrown it.
BTW, there are over 40 lift served downhill ski resorts in Michigan. Some are ridiculously small mom-and-pop operations and some are really really far away if you live in the Detroit area. Only New York has more downhill ski areas than us.