This is an idea that I thought would be useful for some collectors who want to visually see how much they spend on certain games. Like the pie graph shown for collection overview (could this be able to be changed to different graph styles by the way?), a graph that sees the value put for your games and maps it out per dollar amount given (less than $1 games, $1 games, $2 games, $3 games, etc) up to whatever the highest amount the person has in their collection (not counting null values of course).
Another idea would be to map out the Pricecharting data against the spent amount as a double bar graph, it would allow collectors to get a rough estimate of how much their collection is worth versus how much they spent on it.
A couple of small things that I think might make a big difference to the long-time collectors.