Paying for services, especially sex services, goes by the saying 'u get what u pay for'. If its a one time thing, u may not realized the difference as different people might behave differently. But ive tried haggling down on a guy before, thai guy but in my country, and he accepted and we had fun. However, the next time i took him, i didnt haggle and the guy reciprocate and perform much better services that put me in heaven. granted that some guy might try to extort money of you, but majority of the time, based on my experience, if u pay cheaply, ull get half-assed services and vice versa.