Personally I'd recommend suspension, when no activity by the ACCOUNT HOLDER is seen on the account website (tracked by cPanel user name). I'm very forgetful and I'm SURE I'll miss that every now and then.
Signing in at least once, every 2 weeks isn't that bad, considering that they GIVE you all of this for free. And we all know that FREE HOSTS get targeted as venues for spamming, illlegal sites, and tons of other garbage, that RUIN our opportunaties. These activities MUST be policed, and the signing in is part of that protection!
I know I'm legit, but they don't. (although I do wish it didn't have to be that way)
*edit (ALSO, SO YOU HAVE A BETTER CHANCE OF KNOWING WHAT'S GOING ON, AND WHAT PROJECTS ARE IN THE WORKS)