Trying to get a woman is a lot like having a interview for a job. Firstly you have to qualify yourself to show you are capable of handling and are the best candidate for the job. But after you have done this, you should ask what benefits will you benefit from should you want to accept the job as you have a couple of other offers? Because if you don't have high standards for yourself, why should others? Sometimes people don't get the job because they are too needy and too try hard, which shows they are desperate to get the job.
Going up to a woman, you show you're a high value guy with your confidence, bodylanguage and non neddiness, then she has to qualify herself to you-why should you pick her when you have a large selection to pick from.
I hope this makes sense