My LCS has stated several times to potential sellers, this isn't Wells Fargo or we already have too much of that in stock.....
Other's who have some nice things mixed in with drek (so to speak) are just as ornery....I wonder sometimes if people such as these don't research either though.
On the off chance I can get an answer (as it may vary) what percentage of retail does one offer these sellers if they do have something you want?
or is there a standard? 40-60% depending on what they'll take? or does it depend on what the buyer will potentially do with it? cost of slab, ebay--shipping/fees, etc.
Back to the topic at hand, if it's worth it, my response would be: "What you have is nice! but wouldn't sell fast enough for me to make it worth it." idk just a shot in the dark...