Living in the UK I don't tip the server in the pub but will buy them a drink if I'm a regular and get good service.

In the US I do tip because I understand the minimum wage is pathetic and people depend on gratuities (sp?).I would tip at least $2.00 per drink. I have to say that if having more than one or two drinks...very likely!....I often get back in free food & drink what I give the bartender.

With the exception of NYC... I've never had anything for free!