Left 4 Dead saw a 3000% increase in sales during its Steam sale last weekend. Valve's Gabe Newell revealed the stunning figure during his DICE keynote, in which he also announced the digital distribution service saw its customer base increase 1600% that same weekend. G4 noted that the Valve overlord believes those figures broke the game's launch sales.
Steam has certainly been experimenting with numerous sales lately. Valve has even hired an experimental psychologist to maximize buzz and marketing around the online retail sales. Wait, now Valve doesn't just want our wallets, they want our braaaaaaains too? Taking the whole zombie thing a little seriously, perhaps?