[BvS]

I think you mirepresent the approach of GiveWell.

They currently recommend only 10 charities of 408 (about 2.45%) because they have limited resources. If you could scale the proportion to all US charities you would end up with more than 30.000 recommended charities (2.45%).

Besides would you argue the same way with your broker if he only recommends a couple of stocks for your portfolio? If you want to make an impact/return you can't just take a little of everything but have to foucs.

Nevertheless I applaud you for your project. I'm currently thinking about setting up something similar in Germany. One thing I'm wondering about is if some extra incentive is necessary to make people donate/spread the word. Why should I donate now instead of tomorrow or next week (or never)? If you haven't done already you might want to have look how Groupon did it: http://www.groupon.com/raleigh-durham/deals/donorschoose-org.... Like they do with their normal deals there is a tipping point and donation matching (interestingly from a foundtaion not a corporation -> they would have donates anyway but why not trying to double it).