My understanding, from the site Bunker or Bust provided, is that the amount of money you virtually produce by clicking on the charity button goes 100%
to charity.
With each daily click on our network of websites, visitors are shown sponsor advertising. We give one hundred percent (100%) of the collected
advertising fees from sponsor advertising to charity through the non-profit, tax-exempt organization GreaterGood.org. No fees are taken out of the
charitable payments for administrative costs.
Same goes for donations:
Direct Donations: Supporters can also contribute directly to charity by purchasing Gifts That Give More through our store. These direct donations
contribute 100% of the amount paid by donors to specific charitable programs throughout the world. Again, no fees are taken out of the charitable
payments for administrative costs.
Only from goods sold on the site, the profit doesn't go 100% for charity:
Shopping: Supporters can also contribute to charity by purchasing products from our store, including jewelry, apparel and gifts. We pay our
charity partners 3-30% of the purchase price of every item sold in our store.
So on average, of all the profits made by the site, advertising, donations, sells, 15% goes to charity. But 100% of your "clicking donation".