I would assume that were Parking Programs to be so callous as to withhold funds and keep them for themselves. They would just as well allow fraudsters to continue until such times as the upstream provider were to request cancellation. I would assume also that parking programs have an agreement with the upstream providers to report any fraudulent domains. Were they not to report, it would most likely end the relationship with said parking program.
Over the years we have had our accounts suspended at SEDO, Parked and a couple others, only later to discover that it was down to rogue DROPPED domains. Accidents do happen, and I have found all the parking programs accomodating with regards to explanation and of course reactivation.
I would not need to ask a parking program to prove fraud as I track every single visitor to my domains, including date, time, referer, UserAgent and even the URI requested. I am able to audit my own traffic, and therefore happy for the programs to audit my clicks. I have algorithms in place to flag any suspect activity which will email me a report every week at which point I will remove the domain(s) or inform the parking program of my concerns and leave the decision up to them.
Necessity is the mother of invention, and while I cant say that I trust parking programs, I do trust the people who manage my accounts to give me a fair platform to rebut.
Gone are the days when we could just register a domain and park it, and at the risk of pissing of a lot of people, we are responsible to do our own due diligence when parking a domain.
The relationship between domainer and parking program is symbiotic. One can not survive without the other and its therefore crucial on both sides to play fair.
Blog posts,ffa's, PPV and even social networking should be deemed as deceptive marketing when it comes to domaining and parking.
Alex my advice to you would be to learn a lesson that your linking is unacceptable, all you will achieve here is for the other parking programs to watch for you to post a domain for sale and then check if its listed with them and of course audit all your traffic.