It s tricky one.
It depends on girl and as you said relationship you built up.
Personally me is meeting constantly guy for overnights couple of times a month,so he get great deal which is suggested and decided by myself.
Guys that visit me once a month and then announce themself a regular and ask,demand,espect discount probably would be the last ones that would get it,but if i decide to do so for liking someone,or seeing me on a regular bases maybe at least once a week,then it would make me to think about it naturally,and observe such decision.
I m still lurking sometimes ;-)