Those are guys who just weren't raised right, usually with no dad in home, and don't know how to be a respectable man. Women like men like this because it's easy to get them, keep them, just pay for everything.
Only men who weren't taught right by their parents, or the guy is just a lazy mooch go along with the woman paying for everything. If you're dealing with a guy like this...DUMP him! He's taking advantage of you.