I think it was fairly clear it was Tyrion, not his money, in Tysha's case.

I'm not sure you can state that just because Shae is a prostitute she's been "raped for money" all her life.

Maybe I worded it wrong. What I mean is, Shae has sex she doesn't really want all the time. To do that, she has to become a person who doesn't care about that. Meaning she would have no sympathy for another woman raped, because if she can just shut her eyes and do it, why can't the other woman? And if it really is so horrible to be just used for fucking, isn't the money she asks far to little for what's happening? It's the hardnesses you have towards yourself that you most likely also show others.