That math misses some details. There were 30MM hits to about:home, which didn't have an email form. It just had a link to http://mozilla.org/sopa, which got about 2MM hits.

The SOPA page has a big link to the EFF. The EFF site has a tiny box where you can put your zip in to send an email.

So, with all those steps, 1.2% isn't bad. The point of Mozilla's efforts wasn't to just send mail. We were trying to educate people. And 30MM people read about SOPA.

that seems reasonable to me if you look at the nature of the start page and how broad and untargeted the traffic is. I would think a lot of people opened their browser and then just opened another tab without letting it interrupt what they originally opened their browser to do.