Huh? I think there will be a big push to rip accounts since you can have a cache of real money on the account. They'll also be plenty of people taking money on the side anyways through PayPal etc. like TF2. I know at least one person in my house that won't be sleeping for a day though. He built a new computer JUST for D3 and I think he's just be constantly jizzing the past few hours.
I would be inclined to agree with you - however Blizzard realized their massive mistake in WoW of not selling gold directly - it encouraged accounts to be stolen and the gold ripped from it to be sold illegally. Now that there is a "legal" option to buy these items, many players will go thru that avenue rather than third party. Also if I'm not mistaken you can't use the money for anything other than Blizzard products, don't quote me on that - but I'm pretty sure you can't remove it from your battle.net account so you can only use it for game/products from them - making it less enticing to go thru all this trouble. Blizzard will simply ban the battle.net account and all that money will be gone.
The only issue with the money being locked to the battle.net account is some people might go outside Blizzard to sell the stuff. I still feel it was a smart move, and I'm glad they're doing it...I have intent to sell some stuff on there and pay for my WoW with it and such.
As for people being excited - I still know some kids who have never stopped playing the bugridden, exploit filled diablo 2...hell they're probably still playing it while they anxiously have wiener in hand waiting for diablo 3 to be playable.