An interesting thing that never really gets remarked on here is this:
We are expected to believe in Lik's and Abosch's sales because there are these other sales, Gursky and Sherman, with similar prices. This is utter rot, the high prices we see in actual sales that actually happened are all on the secondary market. These are specific pieces that have been rattling around for a while, that have changed hands, that have proved to have (albeit in that mysterious and incomprehensible world of high end art) some sort of "legs". People want these pieces, people have owned these pieces and have been persuaded to part with them for a profit. The value has been established, and re-established at successively higher price points.
Lik and Abosch, on the other hand, with their fake sales, are claiming primary market sales, where the prices simply are not that high. There's a false comparison here, which yields a false "well maybe" pseudo-legitimacy.