the best thing to do is just hit the report button and have a mod sweep it up later. although i dont think adding more and more mods would help the problem.
yeah the community usualy finds them before I do on the forum I'm a mod at, that place is always under attack with spam bots but the group of 3 mods really kicks their asses so hard that most people aren't even aware that it's constantly under attack with spam bots.
so yeah report button does wonders.
I don't know how it works here. but on the forum I'm a mod at, we all get emails in our real email address to alert us. that way if our PM box is maxed out we still get the message
but i've destroyed more spam bots than I can count (perma banned them)