Building a relationship with an ODFI generally takes many months (3-6) and multiple audits (sometimes including PCI), in addition to specific risk and capital requirements. Marketplaces generally have higher compliance & capital requirements, as consumer debits are one of the riskiest ACH transactions. For their customers, Balanced (and others) remove a lot of the compliance & business overhead in exchange for a higher fee (most ODFI's charge less than $0.15/transaction even at low volume).