I haven't seen a lot of correlation between rarity and valuation. A quick example is the Altair vs the Lobo Drives Max-80. The numbers I've heard for the Altair are in the range of 25,000 produced while there were only about 5000 Max-80s produced. There seems to be a lot more correlation between publicity and valuation. Ebay gives a good idea of what the market is like *for those people who deal on ebay*. Judging the value only by looking at the final price can be greatly misleading ... there are a few people who bid the thing to death rather than snipe or bid what they are willing to pay on the *FIRST* bid. When looking at pricing, I almost always go to the bidders list to see what is actually going on.