Issue with this system is that you are assuming a healthy balance between supply and demand.
That is, that there are always buyers (and sellers) at certain price points. For example, the reason why most stocks have (relative) stability is that there is always a bid and an ask. So if I need to sell my stock I either need to sell it for what people are actively willing to pay now, or I hold on to it. If enough people hold onto it the price will go up. I think this is the idea of a liquid market.
I vaguely remember a high end quartz watch that was bumped incessantly for months at a certain price point. Eventually he sold it for the amount he had kept it steady at for 2 months or so, and made a point to stress what the sale price was. It was a arduous journey but eventually he found the one poor soul who wanted to spend $1000.
I don't think OmegaForums and highly niche vintage watches has the type of demand and exposure to warrant a dutch "whatever." It certainly isn't the *best* way to get top dollar IMO.
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