I have been doing tips for years. Not only is it a great way to passively earn, but, it gives people a way to show appreciation for the, education/instruction provided and ‘The Show’ you put on at an event. Performers should get paid!
The best, and biggest, tip jar I’ve come up with is for an Old West Festival. To make the tip jar fit with the festival theme I made a 6 foot long water trough with an old-fashioned, re-circulating hand pump and a small bucket, with the bottom cut out, hanging from the spout. The other end has instructions, as a Wanted Poster, for a coin toss. The kids play all day with the pump, the horses drink, and the adults pitch in coins for a point Reward.
Making another one for the Renaissance fair that will be a open visor helmet in a ‘moat’ coin toss.