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<p>[QUOTE=&quot;Phil Ham, post: 1813264, member: 5787&quot;]I also have a spreadsheet, which includes purchase value and market value.&nbsp; I use ebay as a good judge of market value.&nbsp; Obviously, purchase value is the price of the coin at the date of acquisition.&nbsp; I use an expenential function to calculate the ROI on the purchase.&nbsp; To complete ROI correctly, you will need to know the date that you got the coin.&nbsp; I collect coins as a hobby so my ROI on my coin collection is quite low (about 3%).&nbsp; To me, part of the fun is the grading, value determination, and cataloging.[/QUOTE]</p><p><br /></p>

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