Just to throw out an idea, why not track historical prices and graph them in the same manner that finance websites graph stock prices? People do this all the ti

Just to throw out an idea, why not track historical prices and graph them in the same manner that finance websites graph stock prices? People do this all the time, but don't really have a tool for it. Seems like it would be fun, and (if it caught on) would result in an awful lot of repeat visitors. ...of course, it would be trivially easy for google to reproduce that.