In reply to adventureinmind: We were done a few times..
Its difficult.
The worst was a woman who organised a race.. we designed the race route for an agreed price.. and she never paid.. and then when I mentioned it on here used that as an argument for not paying as I'd embarrassed her..
Brutal Triathlons it was in Llanberis..
She then trotted out 'I'm a single mother'.. no she was a professional race organiser making money out of a route she had agreed to pay for..
We were never that strict, maybe should have been and had a fair few cancellations with weather over the years so normally would offer credit to cover that.
I think we should have had an online payment system, to ensure money was paid or the booking wasn't final.. as a few would keep delaying payment then not show..