Well they say prevention is better than cure. I, myself, believe that it's better to be subscribed to something and not need it rather than not be subscribed and come to urgently need it at some point. By that time, it's just a disaster turned catastropheYep, got the mail about that already 2 times.
Being member helped me to get help twice fairly quick when my server was blocked, but it was in fact not my server but a netblock. And since I had not been on their blacklist for a long time probably our server was mitigated and we could mail again.
It really makes sense to be a member.