I don't think OCD can add things up (but it does add up times of tracks). But you can export data in a csv format that you can paste into a spreadsheet. (Database > Import and export > Export entire collection > Next and then choose the fields you want). There are two "price" fields on the Library tab of album general properties: Price and Original price. I would assume Andrei meant for one to contain whatever you paid for it and the other to contain your estimate of its current value. It doesn't matter which you use for which as long as you are consistent.