Although I agree that sales number isn't an indicator of quality, it is an indicator of how easy it will be for somebody to find players/GMs for that particular game. It will be easier for you to find a group for a best-seller game than for a niche game, which I think has a certain effect for...
PbtA is great for some and bad for others GMs. I know GMs that hate PbtA because they feel that the system doesn't allow you to write your own stories and instead you are supposed to "discover the story" with your players, which means that you must be actually good at improvising the entire...
About running published modules or not, the only problem I have see with them comes from the rise of VTTs and online gaming. The playing ratio has increased so much that you may have issues running a specific module because everyone may have already played it.
My experience in the Discord...