Yeah I agree with that and I did think about that while posting as I knew it would likely come up. I haven't skied Breck, Vail, Key or A-basin yet so my opinion doesn't hold much weight.
for me though, I can go to any of these resorts and have the time of my life.. I'm not spoiled yet because I've only skied a few places better than Welch in my life. My situation allows me to look at these resorts differently than others would.
for instance: Loveland kicked my ass 2 years ago. The elevation combined with my habit of only skiing normally a few hours at a time had me tired as a dog by 2:00. I only got one run in off the ridge, but it was the best run of my life lol... If I paid way more for Breck, would it be worth the extra $$ for me? Not likely at this point. Maybe if I was on a longer trip, got more acclimated, could explore more, etc.
I'm interested to see how skiing Whitefish in March in a similar situation (full day of skiing, more than one day in a row) but at the way lower altitude will change my skiing day. I'm about to be more spoiled
Don't go to Vail then, it will ruin you, lol. I've been a lot of places and it is still my favorite mountain I've ever been. Places like Copper don't really compare, at least for what I like to ski.
The epic local pass is $579 and is unlimited at Breck/Keystone/A Basin....and includes 10 days at Vail/BC. If you are doing more than a handful of days it can't be beat, IMO. Does blackout some holidays, but I'd never want to be skiing holidays anyway.
I'm also a big fan of Keystone. Never had a altitude issue, except for Breck. It is quite a bit higher than the others and you notice it.