Change the way values are determined for mixed condition ie Item and Box

Currently, the way that values seem to be calculated for items of mixed condition, ie Item and Box or Box and Manual is to take the value of the individual pieces and add them together. While this makes sense from one perspective (ie, if I wanted to break apart my items into two separate items if I were to sell them) from another, it overvalues them. The other way to calculate it would be to take the CIB price and subtract the missing item ie if its a Item and Box subtract the value of the manual.

I find that this is way closer to what these types of items sell for on eBay and that the additive values overstate actual values by around 20%. This is a problem specifically when buying collections from your site as I'm consistently having to tell sellers that their values aren't quite what they actually are.

I can still see some functional value in doing it the additive method that you are currently doing, particularly for those who split items into constituent pieces to maximize value. (Though they always have the option in Lot Value to just add two line items for each thing). So perhaps a toggle for the two strategies would be nice.