It's not difficult to see why though. Who wants to do 3-400hrs a year on an entry level TP/Jet with the commensurate time away, when you can go to the airlines and be pretty much guaranteed 900hrs/year - so over half the time to unfrozen ATPL and command, get all the benefits of working for a big company (Stability, holiday, etc). 5 years in RYR/EZY/BAW, over 4000hrs multi crew and the world is your oyster. Or, 2000rs sub 5ton with a big wedge less in your pocket.
I can think of numerous training schools that are struggling to find instructors to pay over 40k/year salaried - let alone keep them for long enough to make any investment in them worthwhile.