He has also used many more plans then Airbus and Boeing. That is good strategy. I usually think of what my passengers would like to fly in an A330-200 or a Boeing 737-700..
That's my strategy as well. Real people wouldn't like to fly in A330 if that means they'll have service 1x weekly. Because they could get a regular service with props 2x daily and have real flexible plans in their lives...
I always have at least ATR-72 in my fleet, and sometimes even Twin Otters or Dornier 228s (they're the last things that make some money).
Even with big big companies I find time for small planes because using them takes as much time as big ones on the same routes (same amount of clicking), big planes' turn times make them inefficient on short routes (many people don't get that) and small planes make things more fun and interesting, and realistic...