As best I can tell, most U.S. domestic carriers are: charging for the first bag, charging more for the second bag, and charging both an arm and a leg for any bag that weighs more than 50 pounds. I have some opinions regarding the weight of the passenger vs. the amount of allowable baggage, weight-wise, but I've been told by several lawyers that these ideas are discriminatory, so I'll abstain from repeating them in this venue. For skiers and snowboarders, it's now a virtual tossup as to which is cheaper: bringing your own gear, or renting gear when you arrive at your destination.
Of course, there's always a third option, one which I'm strongly considering for the future - going the dirtbag route and packing as little real clothing as possible. My girlfriend may not approve, but I suspect she'll change her tune when informed it's her Visa card, and not mine (a snowboarder with a working credit card? Not in this economy!), that will bear the brunt of the overweight charges on our next trip. Besides, I recall a time in the not-so-distant past when it was cool to wear your snowpants for days on end!