I rarely post, just lurk, but I wanted to post in support of TMR. I've bought a couple of things from them. Both times made reasonable offers (ie. not low-ball), and they accepted both times. Both pieces were received well boxed and the condIition was as described.
Their business model is THEIR business model, whether one thinks it's reasonable or not.
If you are a buyer, you have the choice of buying equipment "X" at whatever price (and you can make an offer that can be accepted or rejected). As a seller, you have the choice of selling your equipment at the price they offer (and you can negotiate that as well). If you're a consignor, you can accept or reject their terms.
Their model allows for buyers, sellers, and consignors to avoid the time, hassle, and potential exposure to scammers. These days, the issue of scams is extremely pervasive, and is very high on the list FOR ME. One can decide for themselves what level of safety and convenience is worth any 'loss,' or extra expense, and proceed accordingly.