There's nothing wrong with being nice. I personally have not checked David D C&F's stuff but I do know what it means. Some of his material is cocky but not funny.
Anyway, you gotta have attractive qualities in you to attract girls. Being confident is attractive. Being funny is also attractive.
If you are being only nice but don't sub-com attractive qualities then you will not be attractive. You could find a girl that you are being high value to her and attraction will be built based on your job, looks and stuff. I personally think that even in such relationship you won't be happy in the long run. This is due to the fact you gotta press on girls attraction switches by teasing and doing stuff that some of nice guys don't.
You have to remember that the problem is not with being nice that girls don't like but rather being only nice.
I have pickup girls from their house via my car. Sometimes I open doors for them. I even buy them a drink and sometimes food. The key to my behavior is that I calibrate that with being extra edgy and asshole at their expense.
If you have doubts about game you might wanna check Sinn's document at
http://www.puacottage.com/88/resources
s-man,
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