I don't mean to imply that the number of letters has decreased. But if the majority of the community chatter is about boycotting GoDaddy, then that will decrease the focus on other (much much much more important) parts of the campaign which could have a negative effect. For instance, people may think that they've done their part by boycotting GoDaddy.

It also focusses attention only on SOPA when PIPA is almost as bad.