I think thas gamergate messed up and ran out of CD keys. They got a lot of traffic for lowering their price. You're definitely not alone. I'm one of the unlucky ones too.
Rock paper shotgun linked to them so I guess gave them a lot of customers. I'd never heard of gamersgate really before this. I noticed king's bounty became the number one selling game at gamersgate too.
See the comments over at rps:
http://www.rockpapershotgun.com/2009...ounty-briefly/