No downvotes from me! It's entirely a value judgement, and no one is ever going to convince another person to change their values.
I think the distinction that has been made a few times already about the intention when buying the spot and the reason for the sale is important to keep in mind. If you bought the spot with the intention to play the game, great. And if you end up selling the spot for whatever reason, change of mind, lack of space, obviously you're going to sell it for market value and it's not reasonable for anyone to get mad at you for that.
But the person whose only intention is to insert themselves as a completely unnecessary middle man and skim some profit off a product to which they are adding zero value? No, it's not their fault that an exploitable situation exists. Yes, it's a predictable market phenomenon. But you're never going to find a story where that rent seeker is the hero or is in any way admirable. You get nothing when you pay the higher price a rent seeker demands, other than getting them out of your way. If you paid the bridge troll before the billy goats threw him in the river, you didn't get a nicer, safer, more expedient bridge crossing experience. You just paid to get the troll out of your way. It's not entrepreneurial behavior, it's freeloading based on being big, strong, and scary in the case of the troll in the fable, and based on being successful at buying it first in the case of present day scalpers. Instead of using their time, talents, and energy to be doing or making something of actual value, they contribute nothing more than making money by getting in the way.
Again, these are just my values about what is a worthy way to spend one's life. Other people get to have their own values. And if you're like me, you live within an economic system that rewards having money more highly than it rewards doing/making - it's right in the name lol, so I'll probably be the one collecting downvotes!
And again, it's a bit silly in the context of luxury LE pinball machines, where rent-seeking behavior is at worst annoying. There are other contexts where it's downright harmful. But the principle is the same. I think it's at best gross to spend your brief time on earth rent seeking. We should try to do something worth remembering IMO.