Parmandur
Book-Friend, he/him
Currently the lowest selling 5E gamebook is Kwys from the Golden Vault, which has sold 18,000 copies as of July not including Beyond or FLGS hobby outlets. They produce 5 books a year that sell like hotcakes.They can't be serving it that well, the only people who don't seem to use 3pp or homebrew are people who play the game ultra-casually enough that they have a rulebook sitting around from when they played back in 2018 and maybe some of the psuedo-OSR 5e types-- even casual games that were just put together by high school kids immediately feature someone showing up with something they found online, and asking how to transfer a particular homebrew is maybe like the #3 question I end up running into when someone switched from 5e to PF2e.
But to be honest, I'm pre-emptively a little worried this line of questioning is going to devolve into amorphous allusions to a silent majority that by definition, isn't speaking, with any that do speak, clearly too invested to be counted.