The trick is being Mr Hirst.
All else is opinion. I atually believe that those buying the super-art products are not doing them as investment, but as a means of getting their kicks. When you have more money than you know what to do with sensibly, you do what those folks are able to do: use it for fun. Should your fun-buy then get kicked into another person's pleasure garden, the 'product' may actually gather more moss and be worth that much more. And if it only gets punctured and deflates, so what? You buy another classic car instead.
I really don't think anyone of us who isn't of the super-rich has any idea of what drives such people. I sort of think that is we did, we'd be up there with them too. I've know some such over long periods, and though there were times when I thought I had them figured, in retrospect, I don't think I ever really did.
The trouble with great wealth is that, on the face of it, for those who have it and with whom you are personally familiar, it always seems to have been a simple, natural progression from step 1 to step 2 etc, and the surprise is that one isn't capable of seeing the stepping stones for oneself. In other words, there but for myself go I!
So what's with a few crew-made artifacts?