our EMB's need at least 8 take off's a day to be profitable.
Mmm.. not necessarily. At some point, there is a diminishing returns line between frequencies and the amount of routes flown.
Let me explain:
The core problem with small capacity aircraft is the amount of revenue they bring in. Even though most regional aircraft offer higher operating profit margins, the volume of income is far less then larger aircraft.
So, to off set this fact, smaller aircraft must fly many more rotations then there larger cousins. However, there are two main problems you encounter by flying more rotations: marketing costs and route fee costs.
Too many single routes and you'll drown in higher marketing costs needed to operate those routes.
Too many frequencies and you'll drown in very high route fees per flight.
This is why many players fail at making a successful regional airline. They either fly too many routes, thus creating a huge overhead (marketing costs). Or they fly too many frequencies, thus causing unsustainable routing costs per flight (route fees).
Its a balancing act most are not aware of. You can't fly everywhere... you can't fly ATL-CLT 25x daily w/ EMB-120s... yet all of this must tie in with the fact we already established: Smaller aircraft must fly more rotates to bring in more volume. This makes regional airlines tough to operate.
"Damned if you do, damned if you don't. F****d if you do not."
Hopefully this gives you a bit of insight.