Why is open-source "cheap"? It seems like you look at the cost of things only through the lens of licensing and not the cost of people to run/maintain them. I

Why is open-source "cheap"? It seems like you look at the cost of things only through the lens of licensing and not the cost of people to run/maintain them. I have nothing against OSS per se, but in my experience, the financial analysis of OSS vs paid software is much more subtle.