I appreciate a good hack, but just can't get past the idea that this is a solution in search of a problem. 2 Reasons I would never consider using this: 1. I don't want anyone to have any idea "how busy I am". Maybe I'm old fashioned, but the size of my inbox, like many other things, is no one's business but mine. 2. This effectively makes the sender the gatekeeper for deciding what's important. I want to be my own ga…
I'd never use it either, but I'd also wouldn't post nearly as much information on facebook as most of my friends do.
Ones own preferences might not always be a good indicator the public's preferences.