To be honest i'd much rather someone ask about what some things worth than just offer it up for sale cheap only to realise they have under valued it when someone instantly snatches it up then not want to sell it.
This happened to me quite awhile ago when someone came across a load of machine parts and didn't realise what they had bought. I instantly jumped in and made an offer for the Job lot.!! . . . Now me being the straight type of person I did this to help the guy and I didn't really want them (thou was prepared to buy them) I just knew they where too cheap so I put him in the picture told him what they where worth along with identifing lots of other high value parts that he didn't have a clue were worth. All I really wanted where a few servo motors so after several conversasions on phone and emails etc identifying parts and valueing parts for him on the understanding he could keep the parts I made offer on and sell at correct value if I just could have a few servo's at right price but the greedy Bastard stuffed me a sold the lot to someone else and I never got a servo or thank you.!!

My mistake because I was too nice and should have just bought the lot I made the offer for but it's Ok because I don't forget and only get bitten one time plus every dog as his day.!! . . . . So as you see I'd much rather someone ask the price then I make a fair offer and everyones happy.