Mike, if this helps your math at all...
...unless I'm having a brain fart...and it's entirely possible
...
...you've already adjusted for the cost of the sets in each transaction by listing the $58.74 original purchase price.
If you're keeping track based on what has been "reclaimed", you don't need to deduct the original purchase price of each transaction because you've already done that. All your other deductions/additions (fees, shipping, etc..) are relevant...but that one should not be, IMO.
You've technically, not actually made a profit, until you exceed the $58.74 purchase price...but I think you're closer to that goal then you think you are.
Just my "2 cents"
, and somebody please correct me if I'm wrong, or have explained that horribly.