With all due respect, you are just pulling numbers put of thin air. As shown by ITF above.
Ignoring the fact there's 5 other months to consider besides just September, you're going to have to explain to me why 87 wins is the sweet spot to attract September fans, but 100 isn't better.
And for the record, let's assume 15 September home games. If they DID attract an extra 10000 per game, that's 150,000. Not 500,000.