No shit.
Have you joined the Bambu user FB group? Of course tehre are several, but the one I'm on - there are a bunch of guys that have massive farms that they have going 24/7. Makes me really curious.
Some of those guys have talked about the numbers and claim they are doing many thousands weekly in revenue. But who knows how much of it is actual profit after you account for all axpenses (power, material, insurance, etc etc).
While I can see how you could be cranking out a lot of stuff, and maybe you could make some nice spare change it would have to be a tremendous amount of volume to be more than a normal job and not more work. Especially since you're now dealing with self employment taxes and all the paperwork of a business.
The ticket is definitely finding a niche market with a specialized thing there is a demand for that nobody else wants to bother with so you're not going to just get copied and undercut by another guy w/ a printer that values his time less.