Re: Wrong priority
To an extent you're right, but also wrong.
They need to insulate customer B from nefarious customer A as far as possible, that's true.
But if customer A gets pwnd and the attacker ultimately manages to get a block of IPs added to a RBL then, even if customer A leaves, that may effect customer C (who's been unlucky enough to be allocated one of those IPs).
Would I lose sleep? No. But there is definitely some worth in trying to educate customers not to be complete tools when it comes to security.