Gazillions of Spams?
I think this has something to do with this. If you have to manually deal with hundreds (or thousands) of spams, things are going to get tiresome very quickly. Heck, when I have to delete 10-15 spams (which happens about once a week when the nonsense word bot hits me), that gets tiring. If I were getting hundreds (or more) spams, I'd just turn comments off...

