I don't like begging like this at all. Being a whiny little guy that she hangs out a little with just because she feels sorry for you is bad. She should want to be with you and get excited when (if...) she's asked out. Just compare:
- Do you want to come for a movie-night?
- Just one movie then?
- OK, then...
And then she'll spend the entire date with keeping your hands away.
- Hey, come and watch a movie with me!
- OK then. Damn, then I have no excuse to not go to that expensive date, but I guess I just have to cough up the money and really enjoy myself then.
Leave her with that, and next time she knows that playing hard to get with you will not boost her self-esteem, on the other hand she is flattered about that you wanted to have a boring movie-night with her instead of this other date. (You can also say that the date is too long, too exhausting or what-ever fits a weakness that you have that you don't mind showing.)
The same is actually true in business: Do you want to close only this deal go for this method. But if you want to have fanboy buyers that will buy what-ever crap you're selling, make sure to tell them to fuck off if they are expecting a cheaper model of your product!