To add on to what others have said; if a player has a hard time grasping how their [insert high wage profession here] character is making so little, just remind them that the skill provides them with a net profit, not every cost along the way. A gambler is gonna loose some money before hitting that big score, a courtesan might have to rent a dress for high class function, and a even a pop icon might have to pay off the venue when trying to make an impromptu performance with only a day's notice.
As for high level players making so little, just remind them that just because THEY are rolling in credits and raw talent, doesn't mean the people coming to their shows or paying for those well-cooked meals they make are. Thus, performing for the little folk in small, part-time bursts, isn't going to make a lot.
If a character really wants to put on a show or make a fortune at the holo-poker table, that's where the GM steps in and builds an encounter for them.
