No more serious than your erroneous pronouncement.
I don't know where you're getting this stuff. For example, a simple HDMI cable might cost a dollar or two to make. You can buy them online for around $3. Yet local stores still sell them in excess of $20. Did production costs determine price all around?
Is shipping a production cost? Inventory management? You've already shot down sales costs and infrastructure as not being a part of "everything".
And you clearly aren't into precise language. No offense. Everything does not mean most things... no matter how much you protest.
As far as me being a semantics nazi, I say exactly what I mean (it's surprisingly easy if you just get in the habit early on). You apparently don't. That's why we disagree... you even disagree with your own words.
BTW you don't get to talk about key words when you keep harping on an absolute and trying to act like it's not as problematic as it obviously is. You're at odds with yourself.
In the very beginning as a business you still better be looking at the ENTIRE PICTURE, not just manufacturing costs. To do otherwise is extremely shortsighted. Many failed businesses did just that. It isn't everything after all.