I will tip for good service at a restaurant. I really try to do cash because it is common for management to steal all or a portion of the tips.

I just had this discussion with my wife yesterday when I got a Subway sub for her. When I went to pay it asked for a percentage based tip. Keep in mind this sub was $16 where I live.

I hate that corporations are underpaying their workers and trying to guilt you into giving them a tip which they then promptly steal.