So, essentially the IBM problem of seeing how long brand momentum can keep a train moving?
Apple / Amazon / etc compensates highly to retain engineering talent -> overweight tech salaries -> engineers burning out / leaving for more interesting startup opportunities -> successful startups being reacquired
Unfortunately, doesn't work so well for things like operating system codebases (NeXTSTEP acquisition aside).
I think it's more about appealing to peoples' ambitions and desire to be recognized in this case. Imagine if a VP of Engineering addressed you directly to 'make a big impact' on the company's new secret product. Many engineers would want to impress this person, consequences be damned.