So I am trying to sell my speed concept from 2014, and I listed it for $1800 (not on slowtwitch yet, but it will be soon). Decent condition, shimano ultegra 11 speed, all stock components. Price was based roughly on what I was seeing on ebay/pinkbike/etc. Prospective buyer came back saying he would pay $1200 based upon a website called the bicycle blue book. I hadn't heard of it, so I checked it out, and to my surprise, that is what it said it was worth. What are your thoughts on it?
http://www.savagesentiments.blogspot.com/
http://www.tricoachmartin.com/
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http://www.savagesentiments.blogspot.com/
http://www.tricoachmartin.com/
https://www.facebook.com/teameverymanjack