I have to admit these Mt. Gox clowns are good. I mean really. They have a major flaw in their system that leads to bitcoins being hijacked everywhere then they use that to pitch a $29.95 product called the "yubikey" LOL'd ... probably costs $4.95 to ship and $1.00 to make making a $20 profit per key .... you can't make this shit up! welcome to the world of we fuck it up and make money! 
Hey, go research before you make your nonsense claims. I'll pay you 20 Bitcoins if you can tell me where to get those $1 YubiKeys.
YubiKeys aren't something 'made up' by Mt. Gox, they are used by many services that require 2 levels of authentication.
But that's just the point. Any sane institution would not charge for a security feature on their site given we pay for each transaction we make on their system. They should be providing the security at NO COST!
That's like a bank saying I'm going to charge you a fee to have added security to your money because there is a possibility someone could hack into your account and take all the funds.
If they see a flaw they should fix it or enforce policies to users to adhere to that make using their system safe, not charge them for a security feature that should be in place already.
That is Bullsh*t.
YubiKeys are provided by YubiCo. Those keys aren't free, Mt. Gox can't give them out to everyone because they cost at least $20 when you buy in bulk.