Let's see...do a little algebra, cross multiply, and.. EEK, $334!!
Okay, time to get out my piggy bank to save up to beat his donation and reclaim the #1 spot!
FWIW, my original donation was about 1 time the price of SC2 (Collectors) because Mafia is basically all I play on SC2 now, and I wanted DR to get as much as Blizz got from me.