I think of this as sort of a cop out (on the part of all the people who do it). If you're good at business, then you can have a far bigger impact by creating businesses than by simply giving your money to some charity.

It's ultimately a socially lauded thing to do that divorces the donor from any ultimate responsibility for the amount of "greater good" done with the funds. I think they do it out of fear that they were a lucky, one-hit wonder... and out of low self-esteem or fear of the angry mob.

YC is a great example of a way to use wealth to make a real difference. PG uses his acumen to help a lot more people level up. This multiplies wealth. Spending it on charities simply redistributes it.

It makes me very pessimistic to see that the world's wealthiest people feel the need simply to pledge the money away, and no need to risk total failure by going out on a limb to do something bigger than whatever got them there.

What if Bill Gates tried some long shot idea and it flopped? What if Zuckerberg or Case did? That would take real courage. This pledge nonsense reminds me of the self-satisfied smirks people emit when publicly putting money into the collection basket in a church. Why isn't one of these rich guys going to bat for Wikileaks? (Probably because it feels a lot better to be praised all the time for being such a great person by all the sycophants trying to get you to write a check!)