They are large enough to cover their previous training costs but not their next gen training costs. i.e They made more money on 3.5 than 3.5 cost to train, but

They are large enough to cover their previous training costs but not their next gen training costs. i.e They made more money on 3.5 than 3.5 cost to train, but didn't make enough money on 3.5 to train 4.0.