Norm, I think you have a solid grasp of the big picture. Obviously, opinions will differ when it comes to valuing something. If you do end up selling something for more than any 'expert' thought it was 'worth,' and you don't feel comfortable keeping the money, just pass the excess along to me.
Your grandpa had it right in my opinion, and his native intelligence has been borne out economically and mathematically. When evaluating prices and transactions, there are statistical reasons not to assume anything about the intelligence of market participants (buyers and sellers). Sure some people may be overpaying (or underselling) because they are uneducated, but I am not comfortable making that assumption. The internet boom has lent both efficiencies and inefficiencies to the market, and a careful review of trends can help in spotting opportunities.
I am comfortable using ebay and the mass market in general as one of many sources of value information which is why my valuations usually come in a range rather than a single number. By staying flexible and keeping preconceptions out of the mix as much as possible, I hope to at least stay with the curve, even if I can't get out in front all the time. If I am planning on selling something on ebay I take a careful look at what similar items have sold for (and why) before making a final decision on my Buy It Now price rather than just using a grey sheet.
I guess everyone's approach is as valid as the next guy's, and it's up to you to synthesize whatever info you find meets your needs and develop your own approach. I enjoy the discussion and am glad you've chosen this community to share your collecting with. I have a lot of fun here.
Your grandpa had it right in my opinion, and his native intelligence has been borne out economically and mathematically. When evaluating prices and transactions, there are statistical reasons not to assume anything about the intelligence of market participants (buyers and sellers). Sure some people may be overpaying (or underselling) because they are uneducated, but I am not comfortable making that assumption. The internet boom has lent both efficiencies and inefficiencies to the market, and a careful review of trends can help in spotting opportunities.
I am comfortable using ebay and the mass market in general as one of many sources of value information which is why my valuations usually come in a range rather than a single number. By staying flexible and keeping preconceptions out of the mix as much as possible, I hope to at least stay with the curve, even if I can't get out in front all the time. If I am planning on selling something on ebay I take a careful look at what similar items have sold for (and why) before making a final decision on my Buy It Now price rather than just using a grey sheet.
I guess everyone's approach is as valid as the next guy's, and it's up to you to synthesize whatever info you find meets your needs and develop your own approach. I enjoy the discussion and am glad you've chosen this community to share your collecting with. I have a lot of fun here.



















