I have been saying this for years that bars/clubs are a waste of time to find a girl, and here are my reasons.

1) It shouldn't have to take common sense to realize that if your talking to a girl who is drunk, she is going to have "beer goggles", and then yeah she will give you her number, but the next day when she is sober she will forget you. It's best to talk to a girl who is sober without alcohol to gauge weather she is really into you or not. Having to rely on a drunk girl to get validation is a crutch. And having to use alcohol to give you the confidence to approach also makes you a crutch.

2) Paul Janka who is a legend at pick up wrote in his book "Bars/Nightclubs: not my forte. I have reason to suspect these places are nothing more than money-makers for purveyors of liquor, mops and salted nuts. There’s too much working against the man on the hunt in this type of environment. Women’s egos are boosted because they’ve spent hours getting dolled up so they look their best (or their friends tell them so). Male competition means that ten seconds before you arrived and ten seconds after you leave another dude will be in front of her maw. Male intention is transparent in the nightlife scene: all the girls know that we’re thinking with our smaller heads. Liquor doesn’t help, because we beer goggle and our crudeness really comes out. This leads to the Great Nightlife Irony: women adopt a defensive attitude amidst the very circumstances in which they have voluntarily placed themselves. It’s irrational and a stupid, predictable game. Don’t be a fool. Girls love the attention, no doubt, but they get all pretty, immerse themselves in the center of a bunch of drunken guys, and then complain about men hitting on them! Insane. It’s groupthink at its worst, and once you’re in the general category of “guy” you’ll be treated with a universal, dismissive policy. That’s why I avoid bars and clubs." Keep in mind this might be a little outdated, but he wrote this back in the early 2000's, but there is still some relevancy to what is is saying today.