Value inquiry - Martin Logan Motion series

I'm looking to sell my current setup, but have no idea on what it's actually worth. I've spent some time trying to find other used sets, but came up empty handed. I put it up for sale and haven't gotten any inquiries so my assumption is that my price is too high based on actual value. Any insight would be appreciated.

Martin Logan Motion 12 pair - 8/10 condition
Martin Logan Motion 8 center - 9/10 condition
Martin Logan Motion 2 pair - 9/10 condition 
Denon X2000 receiver - 9/10 condition