Fifeldor: Well, according to some crusaders, it's illegal and unethical to give away or trade HIB keys which were given to you and only to you for free and if the original poster would like to give something away, then the only ethical thing he could do would be to give away an unused unique HIB URL.
Well, I don't think giving away the keys to an otherwise unused bundle is wrong. But a lot of people (including a few on GOG) have redeemed the Steam key for a bundle and then tried to trade or sell the Desura/D2D keys for the same bundle. I don't think it's wrong to point out the unethicalness in that.