I've been voted up 2 times in this question without getting any reputation. Why?
That's Meta... The reputation is just copied from the mainsite...
From the What's Meta? help page:
If you have an account on Super User, you have an account on its meta site.
You do not need to create a separate account for meta; once you are logged in on Super User, you are also logged in and may post on its meta site.
Votes on meta do not affect your reputation; your meta reputation is the same as your reputation on Super User (synchronized hourly), though you earn separate badges. You must have 5 reputation to participate on meta.