I kind of see what you're saying, but you are completely basing your values off of past experiences. Despite what you might think, not EVERY guy uses their girlfriend. I'm very respectful of my girlfriend and she means the world to me.
Yet, most people are right in that you should NEVER expect a guy to pay for your stuff. Don't look for things like that. Look for things in guys like treating you great, being respectful, being there when you need them; not for their checkbook. Wanting a guy for money is absolutely ludicrous.
Look at being hurt as a way to grow. You just found the wrong boyfriends. Find the right one and find one that treats you right. Asking for money like that is incredibly disrespectful and honestly, that's probably how you found such sh*tty boyfriends that hurt you.
Lastly, if they hurt you by not spending their money on you, I hope you never find a boyfriend that's dumb enough to waste his money.
Incredibly harsh, but I said what needed to be said. If you've been legitimately hurt in past relationships from having just crappy boyfriends, then maybe your logic is totally skewed; however, don't ever look for guys because of their money. That will be the biggest mistake of your life.