Coincidentally, today's Washington Post has an informative piece on the economics of museum crowdsourcing. It focuses on two Smithsonian Kickstarter campaigns to raise funds for conservation of Neil Armstrong's space suit and a pair of the Wizard of Oz ruby slippers.
It costs money to raise money, even online. Kickstarter takes a cut of everything raised. The museum needs someone to craft a worthy webpage and is expected to offer pledge-drive swag like T-shirts and tote bags. The Smithsonian campaigns had about 38 percent "overhead," leaving 62 percent for the cause.
The Post quotes Stanford's Lucy Bernholz on crowdfunding: "A lot of organizations get excited because they think it's cheap and easy. Cross that out. It's neither cheap nor easy."
UPDATE: The final amount raised was $78,348 from 493 backers. That's an average of $159 each. In comparisons a LACMA admission is $15, and an individual membership is $60.