For an airline, initial training is a rather marginal cost; they already have the sims and the instructors. For a new jet buyer, the PA includes 2-4 ratings, so no cost there, it's in the purchase. As His Dudeness says, a rating for a biz jet is a very small percentage of the cost of operating. The cost of a EU to US trip in a Global category plane exceeds the cost of a rating by a factor of 4 or 5. Buying ratings is a hamster wheel!
Simple economics says when the costs exceed the expected returns the only reasonable outcome is to leav the game--the market is saying get out! Subsidize your employer and it will never end.
GF