What might cause a pilot to need to eject from an airplane that is not in any distress? The pilot apparently had the time to put the airplane into an auto-pilo

What might cause a pilot to need to eject from an airplane that is not in any distress? The pilot apparently had the time to put the airplane into an auto-pilot mode before ejecting. Why not just fly the plane back to base? I always thought pilots ejected when the plane was about to crash. Given that the plane costs $150 million, it seems like an extraordinarily expensive decision to make if the plane is not about to crash.