Hi @AdamTerrey and thank you for reaching out!
That is a great question. It is required to have an Asana account in order to be the billing owner of the Organization but it is possible to set a different email address to receive Asana invoices.
To do this, the current billing owner of your Organization should reach out to our Support Team authorazing this change and providing the new email address to be set for this purpose.
I hope this helps Adam but please let me know if there is anything else I can help you with!