It’s interesting to read this perspective. I have a good friend and fellow artist who was the first to admit to me he felt this way about his own art — it’s something I’ve genuinely never experienced myself. I’ve always been pretty happy to sell a piece and I do tend to be “over” one once I’ve finished. It’s not so much the technical aspects of the process as once something’s down on paper or canvas or whatever, it’s out of my head and therefore out of my way. My buddy wasn’t able to really articulate himself fully why he was different so this gives me a better understanding.
For better or worse, my mentality is if you actually do indeed want to sell your art, remember that nobody is buying it because of what it says about you, they’re buying it because of what it says about them.