I think that BB-Forest has said that there is some shooting coldness built into the GE. Also, I don't think the GE uses the ratings to determine who shoots, but has some feedback based on performance. So an atrocious shooter is more likely to try a few shots before he realizes how poor a shooter he really is. If he gets lucky, he might keep firing away.
I guess you could sort of think of it as BB players not having self awareness.