That pretty well describes how much effort I ever put into writing and promoting our book. Yet, it is now available in (IIRC) eight languages, and is approaching close to 100,000 copies sold (thus making the publisher a bunch of money...the authors, not so much).

I suppose you could also look to the PMC as an example of how a good idea will always find a niche...there must be dozens of programs and training platform out there that have implemented it (and the applied sports science field has now belatedly "discovered" it), even though I only do this sort of shit for a hobby.