I hear this allot in the places I sarge, more so when I am sarging at/near the bar. I figured I would share my normal response that allows you to DHV, Kino, and a little DLV. It is great response that works!
HB: You wanna buy me a shot/drink/beer?
allcool: Now what would make you think that I want to buy you a drink?
HB: I'm hot/big boobs/some B.S. reason
allcool: Allot of girls have those traits, What else you got to offer?
HB: (she will now be trying to validate herself to you) I'm a doctor/model/yada yada
allcool:(as I grab her hand, I also pull a quarter out of my pocket and place it in her hand, with a smile) almost there Keep going! What else you got?

HB: "You going to buy me a drink?"
White Rose: "are you going to buy me a drink?"
HB: "no, thats a man's job."
White Rose: "says who?"

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http://www.solomonseagal.com

Anyone can walk into a bar and pick up a random girl.
The trick is to make the experience unforgettable to her.
A real PUA will make every women he encounters feel like she experience something once in a lifetime.

I like to just smile and laugh to myself when they say something like that. Take your time and enjoy it, but make sure you aren't laughing in their face and you kinda turn your head a bit when you do it, so its more of laughing at the situation. Then they start to feel stupid for asking and you can tons of things from there, just dig into your shit test stockpile:

"Does that usually work for you?"
"Do guys normally fall for that?"
"I'll tell you what, you buy the first round and I'll buy the second, that way I don't have to worry about you skipping out" (this one makes them qualify themselves a lot because you basically accused them of being cheap and stealing and it hits nerves)

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"The 'Brick Walls' are there to allow you to prove how badly you want something!" ~ Randy Pausch

~ Rye