ubac framed the question in a hostile way which is probably why he was ignored.
What you're describing sounds like a cash advance/guarantee which Hamish mentioned about 'de-risking' offers.
If you have good data that a writer could make X money, but they're afraid to leave their day job - it's easy to just say to them "we'll pay you your day job salary to de-risk this jump for you" if you know they'll make way more than that. You can even offer more.
That's not a 'secret benefit' to prevent them from leaving - it's a smart economic move to help people anxious about perceived risk.