When I first began this endeavor a few years back, I sat down to figure out the cost per round. The bottom line was simple, I could easily beat anything found on the net (Gunbot.net being a decent resource for comparative purposes). One can make many arguments about the initial investment, how to factor that in, etc. It's a moot point at this juncture don't you think?
Today, I think the answer is simple, "who cares." I don't mean to be flippant, rather, as some have pointed out, you made a financial commitment to your hobby. What comes after that point in time is the efficient compilation of adequate supplies that you find financially acceptable to your budget. I would venture to guess that when you shop on line or walk into your local supply shop, you aren't thinking about the cost per round, rather, what is an acceptable price for the next pound of your preferred powder, same with your primer and bullets. When you hit the range, not only are you thinking about what happens in front of the firing line, but how much gold you'll be hauling home with you.
Yes, it's an addiction and we all have our perspectives about how we go about our business. But we loaders are all the same, having the desire to have enough supplies and do what we want, when we want without worrying how external events might up-set our priorities.
Be safe.