Dick
Is this when you are playing for nowt?

If you are getting a fee, then why would anybody give you a tip. I could give you a tip - Would you like a job with sex and travel. Only kidding :-)

Seriously, isn't that like passing the hat round.

I guess the idea is good, if you aren't getting paid by the organiser.

Wether you could enforce everybody to give a tip, is another matter.

If I go to a restaurant, I only give a tip, if I think the person has really deserved it. So it is my choice.

I wouldn't give a tip if I was told I had to. I once went to a very posh restuarant where they told me I had to give a tip as part of the rules of the restuarant. It was an excellent restauarant, but I refused as I was not going to be told to do something against my wishes. They didn't like it and I had to argue with the manager, before the meal. I agreed in the end, that if I liked the service, I would give a tip. I gave 10 pence and got the hell out.