"Recruitment and continued engagement of donors is critical for the success of crowdfunding communities, such as DonorsChoose.org. With donor attrition rates above 70%, a significant challenge for online crowdfunding platforms as well as traditional offline non-profit organizations is the problem of donor retention — getting donors to continue to make donations year after year. Increasing donor retention would have significant impact on the effectiveness of fundraising campaigns, as even small improvements in donor retention can have a significant impact on the amount of collected funds."

—Tim Althoff, Jure Leskovec "Donor Retention in Online Crowdfunding Communities: A Case Study of DonorsChoose.org"