because they can't mate with everyone they see xP eventhough some still do lol, of course we can't generalize, by playing hard to get they test your persistence and determine if you're the right guy, they don't like hesitant guys and give up on the first challenge
I guess that is very true..
Aside from a girl having a hard past or anything that would let her push a guy away or make it hard is the following:
If 100s of guys are gonna approach a girl; heck, she might as well play hard unless that person plays along and turns out to be the one she finds suitable or appropriate for her... Im assuming he should be a confident, handsome, masculine, gentleman that is diplomatic, calm, smart, not-desperate type and capable of smartly letting her discover he's not like the rest of those other idiots walking up to her randomly.
I believe you ladies know better so correct me if i said it wrong. I assume most guys fail cuz they walk up to girls showing them too much desperation or neediness rather than taking it easy and going with the flow... I personally find it difficult to approach a random girl in public and open a random topic to get things moving; even if there is some topic or incident that could strike up im not sure how to confidently carry on... But I know I got alot of good things, aside from my bad part..