as a buyer, I already know what I want. "exciting" or "boring" are part of the process for me. What sells a product to me is a plethora of clearly visible, well exposed photos of the item from all angles, and clear explicit quotes in the listing that detail the condition. For example the description "lens in excellent condition" is less actionable than "no haze, no fungus, no separation", in the event that I am unhappy with the purchase. Maybe some people get excited by a pretty picture of a camera but unless it is for a collector to put on a shelf, I expect that most buyers of a 70 year old camera like the Medalist already know what it is, know that it uses 620 film, so will need to be modified or require re-rolling film, will want to know if the shutter is accurate, and film advance has no issues, and will partly use the visual condition of the item as a proxy to guess at some of the answers if not explicitly states in the advertisement.
Additionally they may wonder (as I would) if the B&W images are trying to hide something. Especially on eBay, I am hyper-sensitive to certain things that I associate with scams. If someone lists an item as-is, haven't tested, I assume it is because they have tested it and it doesn't work, but rather than saying it doesn't work, they leave enough ambiguity that a few people will pay more hoping to get lucky. I'd see B&W photos in the same way.
