I have to agree with pdxmarathonman. If I sell you my personal coins, then you can do whatever you want with them. However, if I trade with you, then I have given it to you specifically and nobody else. It's like if somebody gives you a birthday present. Do you turn around and sell it on eBay? No. Well, it's the same here. I'm gifting you my personal coin and I'm the only one who has paid for them. If it gets sold, then you have said in effect that you don't like my gift. And, if that's the case, then please return it to me so I can gift it to somebody else who will appreciate the time and effort that I placed in creating my coin.