Aspen's 4 resorts are15 minutes apart, all serviced by a free bus. Five days of lift tickets for the gathering, is $34 less than the Epic 4pack.
The OP's much more likely get that extra day of skiing in Aspen, than Summit Co.
No Denver traffic, no rental return, no rental car shuttle bus, no airport train.
And those are all solid reasons why Aspen is a good destination (though I guess many might dispute whether Buttermilk really constitutes a resort for non-beginners/park rats). I just think it's a bit much to piss all over the OP's idea just because he hadn't considered Aspen. Aspen's good, no doubt that's why it was voted for the gathering, but the "Vail is flat, Breckenridge is insanely overcrowded" meme is a bit overplayed. They are popular for reasons above and beyond the very keen season pass pricing after all.