G.O.B. does not perform tricks; he performs illusions. However, G.O.B.'s hand puppet Franklin's alter-ego, Frank, is a pimp who manages whores who do tricks for money. ("Family Ties")
A trick is something a whore does for money. Or candy!
A trick is something a whore does for money. Or cocaine!
From "Extended Pilot"
No, that's not my trick, Michael... it's my illusion.
From "The Ocean Walker"
G.O.B.: This is what happens when you steal from Frank 's stable without payin'. You wanna be her pimp, you gotta settle it with me.
Michael: Pimp? You mean that she's a ...
G.O.B.: Lady of the evening; working girl. She turns illusions for money... tricks
From "Family Ties"