Companies need to leave an auditable paper trail. They go through audits every now and then, where every single cent needs to be accounted for. "Oh, we ACH'd s

Companies need to leave an auditable paper trail. They go through audits every now and then, where every single cent needs to be accounted for. "Oh, we ACH'd some money to that cool developer over there" doesn't fly. Those audits may be for tax reasons (once you send an invoice, the payer can expect you to do your own taxes on that stuff, and they're off the hook) or to see what it's actually spending its owners' money on, which is especially important in public companies.