The upper bound of building a business on top of Stardew Valley appears to be https://www.patreon.com/pathoschild which makes under $400 per month after Patreon's cut. That's not enough to work as a single person full time let alone hiring a team.
A $400/mo Patreon does not exactly outweigh somewhere between 18-35 million sales on a single one of the platforms it supports. I would not call that the "upper bound".
Um... No? [0]
A $400/mo Patreon does not exactly outweigh somewhere between 18-35 million sales on a single one of the platforms it supports. I would not call that the "upper bound".
[0] https://steamdb.info/app/413150/charts/