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ScottDavid Rudd once said that he felt the best way to keep up with market prices was to buy and sell, and I agree. At one time I stopped collecting for about 9 months - the result was that when I was ready to start again, I had no idea what current market values were. I was quickly reminded that SCBC was only a guide as I was consistently overbid on EVERYTHING I attempted to buy, either on ebay or otherwise.
After a few months of re-immersing myself in cards, I won several large t206 lots with a goal of breaking them up for re-sell. I was able to assess my knowledge of prices when I attempted to build a price-list - I needed much more help from friends than I would have expected. I submitted the result to board members and quickly found out which cards were under-priced: cards such as "Rhoades throwing" got multiple inquiries, while a few HOF'ers I was especially proud of got none. I managed to sell about 70 of them to board members, then put the remaining 100 or so on ebay and got the rest of my education. If you can afford to go through a similar exercise, you will learn a lot.