If 10% of all people who play games are stupid (I host a server. 10% is loving generous), then if before STEAM we got 10 new people per week, we would get 1 new idiot per week. New, with STEAM, if we're getting 100 new people per week, we get 10 new idiots per week.
I have no idea how accurate these numbers are, I'm just making a point.