I checked out Gofundme just the other day because I was wondering how much it costs. The answer to my question apparently is 8%. They take a fee of 5% plus a processing fee of 3% which adds up to 8%. The reason I looked into this was because I was thinking if I learned of a worthy cause, perhaps by reading a sob story, and I was moved to give money, I would prefer to send the needy people a check rather than have 8% of my gift skimmed off the top.
In the process of my research I also learned that gofundme is often used as a scam, wherein any third party can start a gofundme page for some other worthy cause. For example I can start a gofundme page to benefit that poor baby you read about in the news who has cancer and was recently orphaned. But there is no oversight that would force me to pass the money along to the subject of my page.