Give the n00bs ideas, why don't you? xDYes, but that would lead to a lot more work for the mods that isn't really needed...
and if people are smart or so desperate to rack up points they'd use proxies anyway
I'm not suggesting that you actually search the IP of every new member, though. Just like, the odd person, scan them randomly and see what comes up.
Regardless, as it's the internet, folk will always find some way to cheat.