The T&Cs are very clear that trading awards is prohibited. Given that, I would not say it's generally accepted that trading is allowed. I think many of us here have enough invested in the WoH program that we would not risk our membership, status, and points by trading an award. I would suspect, though, that, unless one is very obvious about violating the T&Cs, Hyatt has bigger fish to fry, such as those selling hundreds of GoH awards on eBay. You could probably get away with a trade or two, especially if you're willing to take the risk.