It is very expensive. But it's based on the tried-and-tested Apple pricing approach: as high as the target customer will jump. I assume Apple is trying to milk

It is very expensive. But it's based on the tried-and-tested Apple pricing approach: as high as the target customer will jump. I assume Apple is trying to milk large business customers for all they're worth, it is the “pro” market after all. The $800 saving by going for the VESA mount is peanuts compared to the overall cost of a fully-configured Mac Pro setup.