Sure you might save 50K in the short term but long term you're losing 100K plus, as the employee will leave at the first opportunity.
Whilst I agree with the thrust of your argument that a "good" company will look after and invest in their employees, I cannot agree with your maths.
Up until recently there has been a steady available supply of people willing to pay for their type rating. That supply is drying up as the pool of pilots gets smaller. (Ref: CASA annual report) That being said how does a pilot leaving after six months cost the company $100K if they have paid for their type rating?
For me the real issue is places like Air North who cannot get people to fly their Metro aircraft so have them parked. That really costs money.
Can you explain how you came up with $100K cost of a plot leaving if the replacement pilot pays for their type rating as well?