The value of second-hand gear is defined solely by supply and demand, decide what you're prepared to pay (with reference to prices asked by recent vendors) and then wait for a suitable offer. I agree, if you're selling it's easier to lower the price than raise it but asking a stupidly high amount will only alienate potential buyers. Bull***t descriptions annoy people, no-one will spend such a huge amount of cash without some knowledge; although they give us a good laugh.