well, add one more to the list. I LOVE mine, as it has been said, for $7 there is no excuse to not get one. $7 to protect 5 accounts, even if you only have one account, and a level 1 noob on it. that $7 insurance plan could save you $19.99 for the price of a battle chest.
So lets see.
Vanilla wow $25 x5 = $100
Burning Crusade, 1 colelctors, 4 normal, $170
Wrath, 1 collectors, 4 normal, $230
rough guess of about 3 years worth of monthly payments = $576
that's a $7 insurance policy that is almost 99% protection over $1076
no brainer