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This will tie into my spreadsheet that tells me the best use of my money. If you can compare APR with buying things at discounts it can easily tell you if you should pay off a debt, buy at a discount or invest in some other way

First you have to be able to determine what the average price is.

Then you can see how good of a deal the item is

Then you need to figure out how often you use the item

If you buy 10 items that you use about 1 per month at a 50% discount:

Every month you are saving 50% on the purchase of the item

So each month you are basically getting a dividend payment for the price of the item for 10 months

Problem is calculating real roi

Compounding makes this difficult