This topic seemed to be divisive in another discussion so I thought it deserved it's own thread.
Let's assume your GF or hook up buddy is either working at low paying job (admin assistant, non-profit, politics) or is still in college and doesn't have rich parents. She could only afford a modest trip for herself, but you want stay at a nice hotel or resort on the beach.
You make investment banking / PE money or equivalent, so money isn't a huge problem. Are you comfortable paying for her flight and not splitting the hotel with her? Why or why not?
Let's assume the girl is very attractive, because otherwise you wouldn't even be considering paying for her part of the trip