Most companies end up having to work tirelessly to grow because they have baggage of money that needs return. If you can get rid of that baggage it's relatively easy to just slow down and reap the rewards. FANG could all probably afford to pay 10x what you do for 1 hour of work a month if they stopped trying to grow.
If this post is saying "Hey I got this $X0M company for free come hang out with me and I'll give you some of the insane money we are making. You don't even need to work much, the people before you already did most of work but I'm not giving them anything. By writing stuff like this we will get people to buy our coolaid and more of our content, by telling them they can also get the same life. More money for us." Then that's amazing and more power to you. It really is a pretty good deal for the 25 people at gumroad.
Genuinely curious if gumroad was started again from scratch with no investment if it could get to any kind of scale with the kind of work and pay structure referred to in the post.