so what is quality, and does sales matter?
lets jump into multiverse theory here... earth A has Rob A and earth B has Rob B...
both are conseved on a one night stand... but the mom on earth A has the nerve to go to the rich man that knocked her up and say "You have a son" and earth B doesn't she raises him as a single mom in an okay environment
Both robs have an idea for a story. They want to write it, and maybe even make it a trilogy. The story is 100% the same. Remember this is the same story/novel.
Rob A gets it written by 25 and his dad pulls some strings and a publisher puts it out. They even put it out at a time when book sales will be low. Rob A and his dad also purchase copies of the book day 1 and donate them to libraries... lots of them thousands of them. His dad then pulls some strings and gets 2 local highschools to add the book to the reading list for Jrs that year... and then they buy a bunch themselves and BOOM new york times best seller list.... there is this guy who has some pull in Holly wood and he wants the dad's attention so he buys the option for the book to be a movie (he doesn't care if it even gets made) but this triggers some slow news days to do reports on this new up and coming book "Best seller turning into a movie" and that gets more sold...
BUT THE BOOK IS AWESOME, and even with that kick start it just keeps going... months of best seller's the movie rocks and Rob A gets to write some comics and TV shows and put out his next two books.
Rob B doesn't have the same free time, so he doesn't get it written as quick, but by 28 he has (the EXACT SAME AWESOME book) it written. He however can't get an agent and gets a few rejection letters... he is still an awesome writer and tries to write some short fiction and start a tick tok and a youtube channel... he even gets an okay following. He finally self publishes the (exact same) book by 30, and sells a few hundred books over the next few years. it never goes anywhere and he has to save up and use kick starter to get the second book published... but it misses the goal.
so Rob A and Rob B wrote the same book... how can 1 be "HIGHER QUALITY" shown by the sales? Even discounting the cheating the system for the first few weeks people loved the book who read it (on both earth a and earth b) but if we say sales is the rule of thumb for quility somehow the exact same story changes quality...