I thought the same, until I actually took it upon myself to actually try LE. 15 minutes later, I had all my sites on LE, automatic renewal configured. I'm looking forward not having to sign in to some website, cut'n'paste certificates around, convert to/from PEM, figuring out what the correct chain is this time, etc.
I guess I'm stupid then, because I spent more than an hour trying to figure an easy way to add these to my auto-provisioned servers before giving up and using the static cert instead.
