I'm at a loss as to understand why anyone would be even a little bit upset at someone doing this with THEIR item.
It's not yours so you have zero right to be upset about it. If he wants to sell the item for 200k less than the other guy that's his choice. If you think this is going to hurt your bottom line you simply buy the item and resell it for your desired sell price.
Stating that his action would cause you (potential reader) to be angry only shows that you suffer from emotional immaturity and only affects you and not anyone else. Save yourself some wasted grief and move on guys! Crafters can be so pouty lol.