Why the World is Running Out of Pilots

Don't think this really addresses the additional cost of aircraft-type training once you try to be a pilot of much larger aircraft.

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"We've already carefully selected three Airline Training Operators (ATOs), who all offer leading-edge training that'll take you into a job with progression to the pilot's seat in as little as 18 months - and into the captain's seat in around 7 years."
http://becomeapilot.easyjet.com/

"The FAA ATP flight test can be taken in a light piston aircraft with 1500 hours experience. It is therefore common for FAA pilots to earn their ATP (required to command large commercial aircraft) without ever having flown such aircraft. The EASA ATPL, by contrast, requires 500 hours experience as a co-pilot of multi-crew aircraft, with the ATPL flight test being taken on a multi-crew aircraft. "
https://en.wikipedia.org/wiki/Airline_Transport_Pilot_Licence