Somewhat related.
If I go to a restaurant that charges "gratuities" on the bill and expects it, I will NOT give a tip even if they deserve it as that's a pretty cocky move. A tip is something that is earned, not something that should just be assumed you will get.
I'll just pay up what the cost of the bill minus their little scam and walk out.
Last place I went that charged gratuity on top of the regular bill (due to size of group) had slower service and messed up a few orders... go figure. i've never seen a place auto charge gratuity except for the size of the group...