I met Keith Haring at SVA college where he was having an art show, later we had a group art show at the Mud Club in NYC. Keith owed me $50, so he gave me a large framed canvas with barking dogs that had large dicks. I painted over Keith's painting to paint flowers for my mom's living room.
Most of the time they buy what other people buy. They move in great schools, like bluefish, all identical. There is safety in numbers. If one wants Schnabel, they all want Schnabel, if one buys a Keith Haring, two hundred Keith Harings will be sold.