I've found the more glamorous profiles mean more emphasis on price and less chat. The profiles that are more down to earth are going to be less demanding. Also the ladies that bring up cost very early on will be after a price. The ladies that move to whatsapp without talking about price and chat about everyday stuff are going to be more like a FWB and probably accept what you offer.
My usual line is to say that's a bit more than I was planning once I've taken account of the hotel cost and I'd love to be able to meet regularly. They'll ask what you had in mind, you name your price. The ladies who see you as FWB will realise you're offering what you can afford and go with the flow. Also a gift such as flowers, chocolates, perfume, bubbly really help too.