I'm really interested in Lamson and Zed Shaw continues his impressive output, but this service seems fruitless. I can unsubscribe from any reputable company's mailing list. Most useful alerts already come in both HTML and text variants. If I really don't want the mail, I click "report spam". Gmail has already "solved" the spam problem for me anyway.
It's also solved the images thing too, letting us choose what we see outside of simple text.
These people think subscribing to a service makes things easier on us, when in the end it's just making things more complicated, and honestly it's likely wasting more time too. And that's assuming middle-man service doesn't go belly up sometime in the future and force us to manually resubscribe to everything all over again.
Why would I use this really?