http://steamcommunity.com/groups/L4D2boycott/announcements/detail/90227062007438947

To summarize, the founders of the largest Left 4 Dead 2 boycotting group on the interfart were invited by Valve to play a prerelease of the game. Now they don't want to boycott it, and the rest of the group is seeking new leadership. Many speculate hush money was involved.

Valve knows their enemy far too well...

I'd feel a lot more strongly about things if hush money were involved.