Well all jokes aside my main concern would be how keeping track could affect the value of things. while the price of a model m tenkeyless seems to hover around 200, tracking the sale of each one could cause the price to fall or rise. I wonder if noting the prices of other, less known keyboards could cause them to rise. if I actually do this I would keep the first post updated, but I am sure certain items would evade me unless I get some forum help.