Yes, I base my judgement of the cooking exploit on what ArenaNet have had to say about it. They say it was an unintended benefit to the player. Whether they mean it should not have been possible to begin with or that the player recived more coin than they should have when selling to the vendor, I cannot say as I am not ArenaNet nor do I work for them. In the end, though, they have said that that player did was not intended by them. Being that they designed the game, if they say that this was not intended by them in the first place, that is good enough for me.