Although I have never purchased anything from TMR, I have had a couple of pleasant and responsive email exchanges. These guys seem to be very legitimate. They have a lot of great used gear for sale, at pretty attractive prices. Because they tend to sell on the value side of the equation I understand that some of their purchase or trade-in offers may seem a bit low to some. But you can't have it both ways: buying high and selling low isn't a successful business model.
If you are selling or trading gear to a dealer you only know 1 out of 4 things necessary for the dealer to make you an offer: the price you want for the gear. The other factors are what the gear is actually worth (to the dealer's target market) and how much the dealer needs or wants to make on the transaction. You may think you know your gear's worth but you probably don't. And the transaction profit and back end costs are completely unknown to you. At the end of the day your choices are to accept the offer, attempt to negotiate a better deal or just walk away.
If you are selling or trading gear to a dealer you only know 1 out of 4 things necessary for the dealer to make you an offer: the price you want for the gear. The other factors are what the gear is actually worth (to the dealer's target market) and how much the dealer needs or wants to make on the transaction. You may think you know your gear's worth but you probably don't. And the transaction profit and back end costs are completely unknown to you. At the end of the day your choices are to accept the offer, attempt to negotiate a better deal or just walk away.