selling such accounts is illegal by the service provider aka RapidShare itself. I don't think it will be allowed in private forum
However, this type of forum can be offered for the OFFICIAL resellers (which is legal according to RapidShare)Q:Is it allowed to resell premium accounts?
A: No. Reselling premium accounts is a privilege given to our verified resellers. If you are interested in selling premium accounts, please contact us at email@example.com. We aim to offer a fair business opportunity to all of our resellers, therefore we accept 2 resellers per country.