The best way to insure that other users utilize the Reputation System is to use it yourself. People tend to return positive rep in kind to those who have given it.

And it's not just admins and mods with more than one bar. Admins and Mods tend to be the most visible members of a forum so you'll catch us more often than others, but other users have more than one bar. Some of them have be relatively inactive since the end of the season though.