All sex is paid sex...whether it's drinks, dinner, a place to stay, or a hooker, you're going to be out some money. If money is a concern, the hooker will be cheaper in the long run.
Yeah but a good ho costs like 50 bucks and if you're good with real girls you buy her a breezer and make her buy 2 beers for you and you're all set.
The time you invest is more of a problem with normal girls vs hookers I'd guess. (not that I use whores).