After re-considering the two CC threads, I can't blame boar for his valuation. There is an inconvenience factor where if it were me I would be better off cancelling than having someone owe me some points/miles/etc. It certainly is at least in the same ballpark as what was spent for the nights.
The other offer to me is excessive, and earned a spot on my do not trade list for what I feel is profiteering off FTers. However, I agree with Randy that it really isn't/shouldn't be an issue of if it is allowed or not. The OP has free nights in exchange for a flight. At the surface, it is no different than any other trade in CC. I just hope noone rewards this behaviour by trading with the OP, good deal or not.
Boar: Please understand that we (at least I) are not saying you booked with the intention of trading, but many of us fear such a situation arising where we cannot get legit PointBreaks because of other people making speculative bookings knowing they can make a profit off of them, or cancel them free. I have only managed to get one PB so far (IC Buenos Aires) and look forward to more in the future as long as they aren't cancelled due to abuse.