If you’ve ever run an all-or-nothing crowdfunding campaign, you know how exhausting it can be. It’s not just the physical time and energy involved in publicising the project, updating supporters and collecting drip-drip pledges with increasing urgency; but the emotional cost of being a nagging terrier, begging for scraps, often from long-suffering family and friends. As the deadline approaches you might even secretly donate the outstanding amount from your own bank account in order to reach the target, collect the pledges and avoid humiliation.