Earlier quoted context omitted.
To be fair, they also had $700 MM in FB stock (now worth $4b according to the article), so there was incentive to help instagram succeed at FB.
I've always wondered about this. How much inventive is that? When the person thinks "if I work really hard and this, I'll increase my huge pool of money from an amount I can't easily spend given the rest of my life to an amount almost six times as much!", does that really resonate? It's not like it's the same as $700 to $4,000, or even from $7,000,000 to $40,000,000. There are things you can buy to spend most of thos…
First, money at at level isn't earned to spend -- you're right about this. It's more a way of signaling status. Someone getting paid $30 million is less important than someone getting paid $40 million at the same company. This comes up a lot in athletics, too. It establishes your location in the pecking order, which is important in any hierarchical organization. You have to know who's boss.
Second, I think money can be a basis for talent competition. If one company offers $5mil/year and another offers $10mil, you'll probably take the $10 over the $5. Not that it will actually make a difference in your life, but just because it's 2x as much. Perhaps not everyone would make that choice and I think at those levels of wealth, it becomes quite a personal, idiosyncratic decision. But it does get hard to turn down.
Just some thoughts from a guy who isn't that rich.