I would never sell any MOC because i would regret it when i needed the pieces for another MOC.
The only way i would sell something is if someone asked to buy it, i would buy parts off of bricklink and rebuild it at their expense.
I bought 400 rubber axle joiners and the other required pieces to make a track out of 400 pieces. the total was just under £180 for brand new pieces directly from lego replacement parts section.