A myth or a plain vanilla fraud?

Sir Tony Jackson in “Myth that could undermine credit derivatives”, July 2, describes the possibility that the traders on both ends of a deal could, by using their own models, show themselves to be making a profit for years and collect bonuses on these. Jackson describes these mark to market mechanisms in terms of myths, though I would read them slightly more like frauds. Anyhow it all makes me think that the hedge-fund-derivative traders could in a near future be facing the same type of difficulties a tourist has when he needs to talk himself out of a serious problem in a language no one understands... well until now they have all at least gained a lot in the translation.