Wrong, wrong wrong. If you get banned for botting, they provided you service. At that point, they have no reason to refund you anything.
And guess what else Blizzard can do? They can have a collections company come after you and destroy your credit.
Which is more worth it to you? Losing a $30 wow license or having your credit destroyed because you think you're in the right?
Jesus. How hard it is to comprehend what a Preorder is? You really seem to have an issue there.
Anyhow, would love to have you as a customer. You despise your rights and take whatever you are spoonfed on the ToS as the one and only truth(that aren't legally binding as a full contract. They are and act as an AGREEMENT, and therefore, are extremely easier to confront on a court.)
Of course 99% of us wouldn't care enough to actually sue them. Too much hassle for too few to win. But , when they actually find someone who does give a fuck, the consequences could be pretty harsh if it sets a precedent.