Well I never send out invoices, unless you want to consider the confirmation of their account and rebill e-mails.
However.. all of my website, sponsor, sales, go into a business account. Whether wire, check, ACH, etc. All go to a into one of my business accounts, which has a credit card attached to it. I pay for anything, and everything associated with the business from hosting, models, utilities, etc all paid from the business account(s) keeping it nice and seperate, and easy for taxes and the accountant.
