If she's going to be getting $200/buyer each time she goes topless, she's going to want to keep that gravy train going for as long as possible. Afterall, she's only going to be able to cash in on people's thirst for her body for so long. Time is not a friend in this business. Also, business 101 says that if you're selling a "premium" product, you need to cultivate a sense of exclusivity and rarity around it. So I wouldn't expect the topless stuff too often. If she does too much of it too fast, she's inevitably going to have to lower the $$$ she charges for it, thereby turning the "premium" product into a commodity.