I presume you get a free name and an unpleasant nagging feeling from your conscience. It's probably not worth the effort to try to prevent this in the beginning.
I suppose they could take $10 of the $50 you paid them and register the name before sending it to you, and if you like it they'll transfer it to you. If you don't they'll give you your money back and try to sell the name to someone else. But, yea I guess the hassle of doing this probably isn't worth it in the beginning.