Simply put, because some guys, especially the player types, are just big dumb idiots. No, not gender bashing as I'll readily admit that there are a lot of stupid females out there, too. But, guys like the chase. I've been telling one guy "no" for six months, that I don't do booty calls, etc, but to this day he still hits me up to meet him. Ok, well he's not getting anything from me, so he can continue to waste his time, as I really don't care.