I'm afraid about this could be happening again with bitdoubler.org (even if we've registered with another mantainer than .net)
I think about this locking system is curious enough...Laziest admin could not spend time to open a new domain and make it easier to stole the funds.
For me this sounds like "Please stole a few and stop". Sincerely I'd would be honest.
I do not support this system. But I have the community's best interest at heart that they don't get scammed. If you are scared your registrar will shut down your domain, simply choose a different one!