It's a brave girl that asks such a dumb question (about price, not the services) on here. I can't remember the history of your posts Miss Rebecca, but since you were polite enough to accept honest hard talk I might answer further. Unlike you, punting and prostitution is not central to my life. That I enjoy it at times is within that context. It is not about what I can 'afford' - I simply have what I consider sensible limits on what I class as peripheral entertainment expenditure. For visiting someone in your profession, that's 60-80 quid for a half hour and 90 if its exceptional, tops. More is not worth more, and complex menus of services are as boring to me as a car wash menu that takes more than a minute to read. If I started spending vast sums on minor entertainment I would think I had a pathological problem. And if I want a shagfest I'll go on holiday where I can do it to my heart's content cheaply.
On a business level I don't know you personally or well enough to suggest whether your plan to wring more money out of people will pay off. Your question is using the forum for something for which it was not intended. There's no denying your cheek. But you are walking into the dragons den to put it mildly, and you don't have enough bells and whistles in your presentation or a cash flow idea that adds up. I would pass on your services.