As a general rule I look at each offer and when I see those WW guys tacked on to cloud the offer I just decline. I don't agree that's its abuse or anything like that. I mean, I don't think a rule is needed. Owners need to excise caution when looking at trades.
We also could go back to having the "no thank you to offers from bawston" forum thread. I would hate to see anybody leave over annoying trade offers and I am sure the other owners feel the same way.