Now this may be because the buyer is a true-believer or whatever, but equally likely because they're now able to drop a name around the dinner table, tell their friends that they're in direct dialogue with a 'name',... Status signalling, in a phrase. Tell me why some (rich!) people are willing to pay millions of dollars for a painting that looks like a couple of wet blobs on a half-plastered wall. Same forces at work, I suspect.