... So recasting is not done within the RPF community, and if someone here is buying props and recasts them to sell again, indeed that person should be banned from the RPF. ...
The last time I looked this is usually done. Granted, it can be a tedious process, because recasters can be sneaky. And artists can be complicated, too. But usually recaters are very quickly spotted, called out for their actions and do not spend too much time on the RPF after that. The community is very much self-regulatory regarding this, and this is what the RPF makes such a great community.
By the way, if I recall it correctly, outside actions can have an impact on one´s RPF membership.