Both are part of her business. You're just missing the point. She uses the restaurant to cover her losses and secure her incomes if she doesn’t sell enough product. That's why she offered the threesome with Riona for money in the first place.
That's a source of profit she shuts down. By allowing the MC to have free ride she doesn’t get money, she usually uses to secure her global profit. For your record I'm neither a pimp or a prostitute ( you can fantazise about it if you want, I'm not judging) so of course I don't lose money by refusing to suck a dick. Your little sophism makes no sense. Did you miss the part where the MC is supposed to be a customer paying for such services ?
And again you're missing the point. If you can't figure out that both activities are part of her incomes, I won't waste my time.