re: Do actors doing cameos get paid?

There is a SAG scale for paying actors. A few years back it was like $750 a day. Of course, the well known actors work for well above the scale. However, some of the big ones will agree to appear in cameos for the scale rate.

I know when Clooney did a cameo on ER after he left the show, a big deal was made because he did it for scale.