Yeah, if you're planning to be at the bar for awhile, drop a tip to the bartender on the first drink and it'll pay off in the long run.

Here's a tip from someone who worked in enough restaurants growing up to realise that you should ALWAYS tip because it's the right thing to do & only scumbags and cheapskates don't do it. More importantly, the consequences for not tipping can be disasterous if you plan on returning for another meal.