"HIGHLY profitable"? Even at the highest price quoted on this thread, this looks like a rounding error --- in the sense that if you were a startup providing this information at these prices to its total addressable market, you'd have a hard time even getting funded.
The number of firms that can profit from trading off realtime access to fundamentals is not large. It's a market where viable real products need to have customer lifetime values in the many millions.
Even the contracts to run private prisons don't give this much opportunity to gouge.
Were this service run on an at-cost basis would maybe cost $80 or so per month. $200 at most.