If "I" were doing what you are describing, putting a "cost" on the little things, I would tell myself that I am overdoing the "bean counting", and I need to just have fun.", and, "Hey... it is your path, so who am I to tell you how to walk it!".
If you like to figure out what everything costs down to the minutia, so be it. Have fun!
Personally, I do not worry about the "how much does it cost" much, as I do the handloading for the enjoyment of it & even just simple math tells me it is less expensive, after the initial investment, to "roll my own", than it is to buy factory made rounds. The time is not factored in , since I am doing something I like to do & do not consider it a "job", where I might feel the need to make $$ for my time.
I like to cook, BBQ, and smoke foods in the smokers. The results are as good or better than any restaurant, in my & others opinion, & it is less expensive than going out to eat those sorts of foods I like to prepare. The cost is minimal and the time is not counted, as compared to what I would have to spend if I ate out. Same idea, in my book, as handloading & shooting. Or any "hobby" type activity where one is getting satisfaction, as well as use, out of what they produce.
So, "Its YOUR party & you can cry if ya want to."....
LOL
Once again, "Have fun!"! & G'Luck!