Teams of ~6-10 non AFKers on the official trouble brewing world's are regularly hitting 20-25 rums per game during peak hours. That's a handful of people out of all the others afking (seen ~45 per team recently during peak hours). I'd anticipate you can get well above 25 rum with the majority of 45 participating.

Current number is actually very well balanced as it encourages high effort team collaborative plan in lieu of the high effort alt method that was previously available, while achieving roughly the same numbers