I'm a little perplexed/surprised by TMR and who sells to them.....

TMR has become a significant player in used high end gear. Their pitch is "we pay you top dollar hassle free for your used gear" . 

OK, what's their idea of top dollar? It's 25% to 30% of MSRP minus more $ for blemishes that lower value. I know. I called them. 

The same sellers who list their used gear for 30 or 40% under MSRP and refuse legitimate offers from qualified buyers with proven buying or selling history who offer 1/2 or so of retail are roundly ignored or even insulted. Weeks later the same item shows up at TMR at 50% of retail and you know TMR paid half of that for it. 

What makes sellers do such a crazy thing?