Women don't ask men out on dates. I'm sure you're going to respond with that time you asked a dude out, whatever. You don't do it normally, you know you don't. The statistics are so low on women asking men out. In fact, most women see it as a bad idea, because it's risky (sends the wrong signals). When you pay for dinner for your friends, it's because you know them, you have a relationship with them. They don't expect it. It's special. They appreciate it.
For first dates, it seems like just the cost of doing business for most men. For women like yourself, you just expect it from us. It's not received as if it was an act of kindness. It's what you feel your entitled to. And if the date doesn't go well, it just money down the drain for us. We just paid for someone else's entertainment and that person doesn't even like us and we'll never see them again. There is no relationship. Many of us resent it. If the date does go well? We've set a precedent. We have to pay for everything now. It's not because we're cheap. It's because it's not appreciated at all. It's so much nicer to go Dutch and not have that feeling of being taken advantage of.