Lately, I've seen in signatures, "If I've helped, rep me!" and stuff along those lines.
But as far as the rep system goes... You're the only one who can see your rep, I believe.
I dunno. Is it just the presonal satisfaction of having someone say, "Thanks," or "You're super-cool!"?
I dunno. Might be more to the system. Maybe if other people could see your rep, it'd be somewhat effective.
Just a small observation.