I usually don't worry about it too much unless they're busy, and I feel like I'm taking up space, but I ordinarily order at least a 'premium' coffee and somethi

I usually don't worry about it too much unless they're busy, and I feel like I'm taking up space, but I ordinarily order at least a 'premium' coffee and something to munch on while I work, and I agree with the 1 coffee per hour rule. If you can't keep up, or aren't thirsty, you can buy a coffee 'for the house', which basically equates to just giving them money. If you're trying to make friends, or the cashier or barista is cute, you can buy them a drink too. You'll probably be looked at funny (since I'm guessing their drinks are free,) but life's full of weirdos. Might as well be one. ;-)