Ok, guesstimating that the 6 figure sale was around 3x earnings, the total of all the revenue is less than $450k for 5 years. Then you need to allow for expenses and taxes. Might be Ok as a side hustle, but probably insufficient to replace a typical income.
A reality check to counteract all the startup boosterism.
$33k per year, so $165k for 5 years is good enough salary e.g. in Poland where I live, not achieved by 80% of people in country. Why I chose $33k? It's enough to have decent life with some good holidays and local trips along the years. Having $450k income, even if half will be taken by expenses - you still can live a very decent life in many places around the world.
It seems that all these products are 100% online. Therefore it's a very viable income source for people who live in, well, the majority part of the world.
A reality check to counteract all the startup boosterism.