yeah dude, that's pretty gross. I ride 6-7 days a week, and don't EVER wear socks more than once. If I don't get a chance to go home for the night, I'll go to the ski shop and buy a new pair. I own at least 15 pairs, and it keeps growing.
On a side note, I've always worn Under Armour socks. But my last pair was Smartwool, and it was night a day difference. Smartwool are SO much more comfortable, kept my feet cooler, and smelled better at the end of the night.