Because I prefer to not let accounts sit idle with all my information still stored on the servers, doubly so because this account is also tied to my Origin account, which involves real money and personal informations on me like billing adress and credit card details, stuff that I do not want to float around the web unless I need to.
Besides, there's no perks to being active, I can read the forum just fine without logging in if I want to and if there would EVER be practical benefits for signing up, I can do so with a fresh start should I chose to.
Now ... anyone knows whom to talk to (other than Jesse Reid who appears busy/indisposed at the moment) to get this thing going?