I've been trying to think of some way to make levels relevant in the game, and I've come up with two ideas so far:
1) Make the skill progression dependent on leveling (ie, gaining a level grants points to spend on skills and stats, or level acts as a cap on how much of each skill a girl can use - a level 1 girl may have a BDSM skill of 100, but she would be effectively capped at some lower number). This was discussed to an extent, and it didn't look like there was much enthusiasm for it. So I though of:
2) Tie levels and compensation together. Higher level girls attract wealthier clients who are willing to pay more for their services. Conversely, higher level girls get "pushier" - they want better accommodations, a bigger cut of the take, more perks, more free time, maybe some sort of leadership responsibility (if anything like that gets implemented). If they are free girls, they are more likely to leave for greener pastures if they don't get what they want or are otherwise treated poorly. If they are slave girls, they will be more likely to attempt to buy their freedom, and failing that, run away. High level girls might even make friends in high places who could bring pressure to bear on the player if they don't get their way.
I know the higher levels = higher compensation was done in SimBro, but I think I have sufficiently expanded on the idea to make it more interesting, less of an automatic income booster, and it has potential story hooks. Any thoughts?