Actually, I don't even know who the guy is.
But....as always... I seem to be on the "other side."
IMO he should go for as much as he can get and not have to justify doing so. Sure, he's been offered something I'm never going to get within smelling distance of financially. Well more than a family "needs" to prosper. But to me that's irrelevant.
The fact of the matter is that the person paying him is expecting to get a lot more value than is being paid for his services. So if he wants to fight for a bigger share of the pie that he is splitting with other rich guys, he should go for it.
These kind of things are never "should a rich person be satisfied so non-rich people get more" -- they're merely "which rich person should get how much."
Frankly, if I believed that someone is going to be willing to pay me two gazillion dollars for my services, I'm not going to settle for a mere 1.5 gazillion.
Now of course if the employer turns out not to be willing to pay the 2 gazillion, I'd be hosed. But such is life.
Go for it, dude. Go for it.
And do not be conformed to this world, but be transformed by the renewing of your mind, that you may prove what is that good and acceptable and perfect will of God.
Romans 12:2 (NKJV)