correct me if i'm wrong but don't you have a payment inherent in the fact that free girls only hand in 60% of their takings where slave girls are per default set to 100% ?
The percent take is a commission (like what a car salesman earns when he sells a car), whereas paying them directly would be a wage. Wages are flat with respect to how many customers show up in a given week (in the case of our game), and so represent a stable income stream for girls. There are currently enormous income gaps between jobs in WM: whores bring in tons of cash, which is attributed to the girls directly (and so a commission-based payment system makes sense); strip bar work is a mixed bag, part of the money is directly attributable to a girl, while the rest comes in terms of increased customers for whores, so a mixed commission- and wage-based system makes sense; casino workers have no directly attributable cash flow, but they bring in customers for the whores, so a wage-based payment system makes the most sense. I don't know if income from movies gets attributed to the girls or not; if it isn't, then wages make sense.
Of course, this might be way above the level of fine-tuning that players will want to do (I know MBA's who scratch their heads when I talk about this stuff with them, so it's probably too realistic for our purposes).
What if we simply change the whole system over to wages? Wages are easy to understand - you know what you are paying, and girls know what they are receiving. Then we can easily assign wage tiers for each job (Unskilled, Amateur, Skilled, Professional, and Superstar), differentiate between jobs (say, strippers are paid less than whores), and assign scalar multipliers for difficulty and for girl demands (a girl could come to you asking for a 5% raise, which is easily handled by using a 1.05x multiplier to the appropriate wage rate).
Thoughts?