Good question. The time I did it a couple of months ago I enjoyed it. I can see what prostitution should be legal. It's a great service, if you're single, and that's all that you are looking for. It's easy - you save your time and effort trying to get a gal into bed with you, and just pay for it.
Honestly, I'm not going to do it again. It was an interesting and good experience, but it's dangerous on many levels (illegal, could be pimps hiding in the room, etc.). I just peruse BP every now and then just to see.