You don't win anything by buying gold though. Because it transfers wealth and does not create it. All you are doing is coming in second place to a person that has already won that gold.
- - - Updated - - -
Did you read the description of the white version of the mount? It literally references a gold sink by saying the color makes it rare and thus expensive. The AH mount is a gold sink. All high priced mounts are gold sinks. They have invested development resources into gold sinks over the years. Expensive mounts are not created for "dumb players".