I think this is perfectly OK. In fact, it is an improvement over free markets in that people who want things fast will pay a premium(double?) for doing so, and people who are willing to wait will pay less. So if you are against adding the time coefficient to the price of an item then I suggest buying things on sale is also unethical under your definition. Besides being a collector of electronics I also collect watches and cameras. The Nikon Z9 is a hot item right now and is never in stock. If you want a new one you go on eBay and pay a 25% premium. Look at the prices of Rolex(too expensive and would never own) over the last two years. The black( secondary markets) are playing a much bigger role in our economy than people realize. Just look at the Sony PS5 turnout.
Ridiculous sale
Somebody is selling a Decware that sells at 2600 $ direct from the manufacturer for 4500 $ citing tha t you can pay that if you want to wait a year. This is a disgrace in Audiogon. Also TMR sales require you to go to their website and look for the product for information. Unfortunately the hobbiest mentality that predominated Audiogon Is being replaced by these dry, unfear actions and styles. What a shame.