Monster M1.2s speaker cable: fair price per foot for resale?


Want to post my lengthy Monster M1.2s speaker cable that originally sold for $6.00 per foot. I have several lengthy sections that are 100% warrantied for life to ANY owner. I'm a Insider subscriber and did a Blue Book search and it just reports back "$100.00". What is that value estimate based on? AND / OR your thoughts about a fair price per foot for resale?
dougeyg
I'd never buy a Monster product myself based on their past business practices.
What length(s) do you have?  Are they factory terminated or bare wire?  A number of years ago this cable was being sold on eBay by the 250’ spool for pretty cheap.  No more spools are around, but plenty of factory pairs for sale as well as bare wire sections.  
BIG THANKS to each of you that responded. I'm "barely" active on these forums, just a guy trying to move some of my past gear. Thanks again!