I don't understand the art market at all, but I adore gursky cause of its way of making "photography" its more like painting with photographic technics.
The following in german, sorry,
Er überhöht das Objekt durch Multiplikation, wodurch er eine viel intensivere Bildaussage erreicht.

Yes i also respect him,he invented his own style and why not make a photo better with a help from computer,i'ts just a tool.