I see parent's point as how you'd evaluate the performance of an international superstar in your team.

You'd do reviews where they'd have top performance, but not 3x or 4x more than the guy right below them. And if their presence didn't push your team to be #1 in that season, you could have an argument to replace them for someone cheaper and 90% as good.

Of course, their sheer presence could be a booster for marketing for instance, and there's a lot more going on, so usually you'd keep them around even if on paper it doesn't make sense, but it would look like a complex balancing act.