I put down $1 (it wouldn't let me put $0 in the application) as my revenue and got accepted. I got the Ink Cash last year under the same circumstances.
Both times the application went into "pending review" and I just waited it out. About a week after the application I got my acceptance e-mails and then a few days later the card in the mail.
Normally I would call in to "recon" any application but I felt I was just safer not doing that for these business cards.