A bit of advice from me if I may offer it (assuming you're a genuine punter lol) -
not sure why you'd put up cash for a reverse bid for a 1 hour incall, considering that's pretty much the bread and butter offer that most women would have on their profile anyway? And £150 is fairly steep for an hour incall for most places. Hence perhaps why you are getting offers from WGs who would normally charge less than £150 an hour - they're not doing anything 'wrong', their own normal rate is irrelevant - you are offering £150 an hour, they're offering to match it, can you blame them?
Personally, not that I'm an RB expert, but maybe makes more sense to save reverse bookings for long or 'unusual' bookings where you're looking to save maybe a couple of hundred quid on what most WGs seem to charge, e.g. an all day or all night booking, evening in London with a couple of hours' shagging etc.? An RB for an hour's incall seems a bit unnecessary, not least as in a sense sometimes 'you get what you pay for' - an offer of say £80 or £100 for an hour might be from someone who's going to give you dogshit for service.
Just my two pennethworth.