I have one for sale on ebay right now. Seems like the damaged ones drag the market down and everyone is afraid to to buy one for fear of getting a lemon.
I expect to get around $120 for mine, and it has never been reworked or dinged. Time will tell. I am probably giving it away considering that this prop new would be $400, but I can't have it gathering dust in my garage all year.
So the short answer is that used props do not seem to hold their value well, IMHO.
Mastercraft 13.7 X 19.5 OJ prop: