I think people posting stuff about their own non-profit making events is fine - but agree when it's a business. For instance if someone is organising a club triathlon event I wouldn't have a problem with them starting a thread saying please enter our race - but if they are doing it for money then it seems right they pay to advertise.
Got a bit of sympathy for the OP as his coaching day probably doesn't generate enough money to pay for advertising here - but that's just one of those things. Plenty of club forums that will put a free ad post up if you ask them nicely.
Edited: 04/03/2013 at 09:55