This thread reminds me of when tried to pull a stick out of a girlfriend's dog's mouth. I pulled and he clamped down and resisted. I'd pull harder, he'd clamp down and pull back harder, I'd lighten up, he'd relax. So we're standing there each pulling on the stick, and I looked into his eyes and there was absolutely no one at home.
Back to topic, although IMO anyone who pays $4 million for a contemporary photograph has more money than sense, I expect the Gurskys are very impressive seen in person. I understand that Eli Broad is quite a Gursky collector, so I am hoping there will a few on display at the Broad Museum when it opens next year.