The big resort, US prices are insane. I usually wind up doing a day or two of lessons / guided skiing with my family on our Presidents week trip, because a) the trip is usually insanely expensive anyway, b) we usually learn something about our skiing and the resort c) we get to cut lines on busy days, and d) it always winds up being a great experience. I never just call up for a reservation - I always have a referral and know who we'll be skiing with. It's worth it to me for those couple of days per year, but I still choke on the number a bit.
By contrast, in Revelstoke last year, the full day privates were approx. half of what the US costs are. We had such a good time with the guide (a level 4 instructor) that we wound up booking a few more days and in the end, we did 5 guided days. That included a big pow day when the line at the base was 90 minutes+. My wife was on a conference call for work when my son and I headed up with the guide. We got to the mid station and we got a message that my wife's call was done and she could come and meet us, so instead of going to the top of the mountain we skied down to pick her up. Because of the line at the gondola, no one was skiing the lower mountain and risking getting stuck down there for an hour and a half. We skied 3,000 vertical feet of completely untracked pow without stoping to go and pick up my wife. It was one of the most memorable runs of my life.