Is it feasible to send marketing emails entirely as images - apart from a link at the top, giving the option for the recipient to view the email online (in their browser) and one at the footer to unsubscribe from our mailing list?

Anyone who's coded a html email template before knows how much of a pain it is to end up with the final design that displays 'properly' (rarely does it display the same in all clients) and doesn't break.

I understand there's the possibility of people simply ignoring the email altogether should their email clients be set not to automatically download images, but many of our email primarily feature images anyway. Thoughts?