The reason for this is because women are too fussy. When men approach or chase women, it seems that women will disqualify a man over the most ridiculous thing. "He was a little too overbearing," or "His beard was a bit too long," or "He asked for my number too quickly." Is it any wonder why so many men are afraid to approach women?
Another reason it makes more sense for women to pursue men is because it's usually easier for a woman to get a man than for a man to get a woman. It seems that most women today prefer the man to be the one to ask them out or pursue them, which is why so many women end up being single for a long time. The mindset of many women is, "If he hasn't got the balls to ask me out then he'snot worth dating." But like I said, women are so fussy today that many men are afraid to ask a woman out.
A man is far more likely to be turned down. It's usually easier for a woman to get a man interested. Women are naturally more attractive than men and therefore the don't have to work as hard at getting a man interested. For most men, it can be difficult getting a woman to choose him over all the other guys. So it makes far more sense for women to do the choosing, but also being the ones who ask the men out. But instead, women remain stubborn and allow the men to do the pursuing, and it's usually the assholes and bad boys who have the most confidence when approaching women.
In my experience being a former bouncer at pubs and clubs, the best way to get a woman interested is to ignore them and pay them no attention. In the past I had quite a lot of women chat me up for simply showing no interest. I just don't see any point in a man chasing a woman these days.