I've wondered (questioned, thought about) the relatively tiny amount of keep/edit votes needed to keep a given node around, blithly (from my view) ignoring the number of delete votes. As mentioned there are quite a few more moderators, and speaking from experience being somewhat new to the task, I've nearly hit the wrong button a few times for doing what was "good" for the monestary (in my opinion of course). Plus, sometimes I'll act rashly and then mull it over and wish I'd not have "voted" that way.
I'm sure there has been a lot of discussions about this topic in the past, but I haven't supersearched at this point. If this sparks a healthy debate, great; if someone points me to the FM, I'll accept that too. If I've started a firestorm, I appologize.
-Scott