I don't think anyone would argue that it's pretty shady, or at least pretty lame, for people to inflate demand for ANYTHING they feel is going to sell out or be hard to get just so they can turn it around and sell it for more, whether its a pinball machine, a nintendo classic (remember trying to find one of those for your kids at Christmas time a year ago?), or an essential.
That said, I also don't think anyone here has much right to be judge and jury when it comes to knowing why someone would be selling a pinball machine spot, or has the right to demand that answer from anyone. It's personal. If you lost your job, had a medical emergency, were in a precarious financial situation, had legal fees for a divorce, hell if you just played the game and changed your mind... Whatever the reason, if you COULD sell something for more than you paid at that point, wouldn't you? And if that WAS you, would you want to have to explain or justify it to be able to do so?
Some people are d-bags, but not everyone has a nefarious intent. I have a deposit on R&M with every intent of actually buying it. But if I had to start selling stuff off to make ends meet, selling a machine I don't already own or would have to move would seem pretty tempting.....and if the risk I took by buying a deposit for a sight-unseen machine results in a reward in the process, then good for me.