Lol, we don't tip in europe, you are lucky if you get the last 5 cents of change on a 59,95 bill.....
It depends. I think tip is normal in some hotels, bars, nightclubs etc
I sometimes tip my self 10-50dkr and get free coffée & shoots from the bar at some places. Not as much as 15 years ago
I sometimes get in front of line when ordering the next round
I have donated the fh2 server once
I think every tip is worth it -:)