I for one am glad we have a free market in pinball. If I buy a machine I certainly wouldn't want any restrictions placed on why I bought it (Hobby or business) what I could do with it, how long I can own it, how I sell it, who I could sell it to, if I am allowed to sell it, how much I could sell it for etc etc. This hobby deals in high value assets (relatively speaking) that can increase and decrease in value. The last ten years has been unusual as a huge demand has come to market with very little supply. We all reap the benefits as we see the new pinball manufacturers, innovations, and parts increase to meet demand.
In this argument the seller took a business risk to establish a high volume of overhead, upfront cash and then storage, with no guarantee of profit. I understand that people feel like this could have been sold to someone else that wanted to play it but back to my original point I prefer the freedom to do that then to be told I can't buy because of what my intention is for buying it.