My dad told me the stork brings them.
See, here's the thing. Onmilo has the edge over many 'papered' gunsmiths. One of my best friends went through the corrospondence courses and got certified. (I wanted to do it with him, but it didn't wind up happening that way.) He got aligned with a small-town pawn shop, and they started bringing in work for him. The first problem was, when he would come home from his day job, we was so tired he never felt like tearing into a stranger's gun. It started stacking up. The other problem was, he was learning a lot of the finer points the hard way. He was damaging parts, having to replace them out of pocket, and not making any money anyway. After replacing the action on a rare Weatherby rifle, he decided to become a chopper pilot, in which he is very successful.
It would be nice to know enough to adjust my own triggers, re-barrel old actions, and install my own night sights without paying someone else to do it. But to REALLY be the guy who knows all guns inside and out, sometimes better than the manufacturer, and can do things like custom engraving because they are a true artist, that takes a lifetime of learning and mentoring. (My stick figures suck.)
The way I see it, being a gunsmith works one of a few ways. You can get basic certification, and replace broken parts and clean strangers' guns. You may make a little money, but probably not. You can get a contract with a police department and have somewhat regular work doing annual inspection and service on all their weapons. That might actually be safe and secure. Or you can go all out as an artisan with a nationwide reputation, as in, "Mail me your gun with a $1000 deposit. Minimum wait one year." Then you're probably making enough money to be comfortable.