Strippers CAN rp their way into character-paid tips (and should), but they don't have the above opportunities.
Also, I sort of expect strippers to tend to make more than bartenders.
In general, more automated income isn't something we generally like adding to the game. Neither is "fairness" - everyone isn't expected to be eligible for identical levels of salary, tips, etc, with identical levels of rp-less grinding.
If bartenders are dis-incented to show up for work because of the income, that's either a character or a player who doesn't know how to make that job work.