Here’s an example from Fundable’s site;

Amelia, a twenty-year-old classical soprano singer, pre-sold her first CD before entering a recording studio. “If I get $400 in pre-orders, I will be able to afford the rest [of the studio costs],” she told potential contributors. Fundable’s all-or-nothing model ensured that none of her customers would lose money if she fell short of her goal. Amelia sold over $940 in albums.