If we are talking about self-respect, I went bankrupt a few times.
Most you've ever spent on a date without getting any?
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Spending lots of money on her before she puts out creates horrible incentives, and in fact, probably makes her less likely to put out because she gets rewarded for doing nothing. I'm certain that 99% of you have taken or taught courses in incentives, just apply it.
My own experimental evidence suggests that the best luck is created (on average) by refusing to buy her anything up front. Even better, try to get her to buy you a drink. If you need practice, try to convince a homeless guy to loan you a quarter.