There's a huge number of dollar van systems all around the world, they're usually profitable, sometimes profitable enough to wage wars against competitors.
Public buses: Big, amenities, lose public money. Private minibuses: Small, rough, earn profit.
Moreover, they can totally turn the table with regards of quality of life. Village where my granma lived had a bus from the city maybe once per for hours. Now it has some bus still, but also a minibus every 15 minutes! That's a game changer.