Hugo, you might consult with St. Christopher or Juan since their experience with AMPs far exceeds mine. I don't ever go expecting anything less than full service - which I consider to be a table massage and GFE treatment. I always select the provider, make reservations to insure that I get that person, then I pay up front and always leave the donation on the table so they know that the transaction will be made and they won't get stiffed, or under valued. It's always $40 for 30 and $$ for the hour. Then, depending on how well that provider responds, the pot is sweetened. I can only remember 1 time in 15 years that I was disappointed with the outcome of a visit, and felt that the value was not equal.
An old Hawaii provider (Happy) normally captured my entire wallet - and I was willing.
And in comparison, I have been disappointed several times with indies where reviews were misleading and the services were poor. Asians are almost trained at birth to be accommodating, whereas others are not. In Vietnam they even massage your head and neck as part of the overall service - a level of providing very unusual to the states.