Sometimes you can’t pay the owner not to leave. I’ve had two colleagues die. Another one had a stroke. Granted, I’m now around for like 20 years and a bit, things like that are rare, but no money in the world could have helped in these cases.
And sometimes people are just ready to move on. It doesn’t need to be because they’re underpaid or it’s a bad work environment. I was there and just wanted a change to a somewhat different type of work.