Servers and Bartenders, How Often Do People Stiff You on Tips? [POLL]

My tips start at $5. I don't even look at the check. I just start at $5. Every time the server does something I like, I up it. If they do something I don't like, I go down (but never below $5). So sometimes $5 is a great tip for the check, but I have a large family, so it really depends on their service whether they end up happy or not. I recently found out some people don't tip at all!