For example, I'm sure the average joe doesn't know just how expensive calligraphy pens can be, or how deep the rabbit hole goes on video game speedruns.
Most people don't even own a soldering iron to wire it all. That's another $20 right there. Just, it's fine to say DIY is about the fun. And by all means, anyone who wants to have fun tinkering with some tech, go ahead, it's a blast. But it's never about the money. It's disingenuous to tell people, “Oh I did this $300 at retail machine for $10”. No, you didn't, you are just doing creative accounting and failing to report previous expenses. Because if it could be done for $10, big manufacturers would be doing it for $7, because they have the advantage of economics of scale.