Dude, that is awesome! Yeah it is a lot of work, but it can be much more rewarding this way.
I like the term sock investment. I only hope for many filled bathtubs in your future!
When you say very beginning, do you mean Youtube beginning or when Google bought them beginning. Just curious. (me its 2006-2007). I made some videos in 2014-2016 but I was not paying attention to my surroundings (story of my life ADHD and all). Many people said I could of been much bigger if I did what I do 2-3 years earlier. Some say I never would because I speed up my voice, (everyone had a schtick, that was mine) and I honestly, wouldnt mind another 5-6K of subs, if they were good subs, not the abandoned / bot / spam subs I got now.
I ran my own biz too. With the same ideals but after my 4th year (Web dev, video) I was making enough to bring on a part timer, and I also felt I could of opened my own office if I wanted to in the next few years. BUT, health insurance is incredibly expensive, the good ones are when you are a sole proprietor were astroniomical. Add in the fact I was calling, emailing, doing lunchs, dinners, on site visits, finances, bill collection... then at 10PM I am struggling to stay awake and actually get the job done I was paid to do. Signing off at 1AM I just realized... um, no. I had to make the decision. Bring in a part time administrator, part time developer or ramp my business down and look for a job.
So I opted to go the corporate route. Found a larger marketing firm, that paid ok, but had good health insurance, flexible time and lets me do my thing to get the job done. Can't complain really.