However, you lost BTC. The BTC price paid for said items at the time they were bought is greater than the BTC they have produced.
Well, no, that's false, but hey don't let facts get in the way of a good argument.

I've never bought BTC for fiat, every BTC I've mined has been reinvested or cashed out to fiat.
Well yes. "BTC price paid" is whatever you paid converted to BTC, be it prayers to Luke, or Indian Rubles. So again, yes.
In fact the early Block Erupter boards and AMUs were so over priced that even I (who got an AMU from FriedCat - probably one of the first of anyone not inside Asicminer) have still not made 2 BTC on it - that was the price they were then, though I didn't pay any BTC/Fiat for it, and I expect to never make 2 BTC on it.
Go check again.