I'm not exactly sure what you're asking but let me try. If you're asking if a gentleman should pay travel expenses for a lady to travel to him for a multi-day engagement, then yes, it is customary. Some ladies build travel into a multi-day fee but as long as it is understood up front, there shouldn't be any trouble.
On the other hand, if you answer an ad or request for entertainment in a particular locale far, far away from you and expect a free trip, Sorry Charlotte, that ain't gonna happen.
So when my atf calls me and says she wants to come and spend the weekend I shouldn't pay for her travel?...I once told her, "I bought the car. You can buy the gas." She didn't come to the party! lol