Just curious: how much might a top radio DJ from a major metro market (like NYC) make on the side for DJ'ing in clubs?

I live near NYC so I listen to NYC hip hop stations (like Hot 97). Every week I hear DJ’s say they are going to be in this club or that club on Friday or Saturday night. I am just curious how much a DJ like that from a big metro market might make for doing some Friday or Saturday night work in “da club.”