Sachys: NO.
trading is trading - if you trade 300 stcok on the UK market for say... russian oil... do you expect the buyer to keep them forever. No, you dont.
If you gift someone a nice vase around christmas time (when theyve asked for it), do you expect them to enjoy it and make use of it once given that thing they desired? Yes. Yes you do.
Now, stop being a bunch of willy-nilly twat bastards, please!
If YOU want to put a bunch of rules on YOUR trade offerings, make it clear.
If YOU intend to ask for something as a gift recipient with the intention of trading it later. FUCK OFF!
PRETTY FUCKING SIMPLE EH?! * * * * *
Edit: actually, fuck all of this off. Nobody is going to listen and go "oh, thats right - that actually worked for ages until we allowed trading profiteers, paypal profiteers and whatnot to enter the trading thread and now we dont have a clue of what used to happen previously..."
Personally, I don't care what happen to a game once I've traded it away. That person could sell it, retrade it, dress it in a pretty dress and invite it to tea, whatever, it's their game to with as they wish.
I do however understand it from the point of view of people who see trading as another aspect of gifting. And for those people, I will attempt to abide by their implied wishes in a trade.
I think the best thing for a trade is to always be honest and ethical about it. I've said it before, but I'll restate it - a trade is meant to be mutually beneficial.
That's all. :)