Buying bitcoins is too complicated and takes too long for a normal user. On Bitcoin Black Friday, I´ve read in a few other communitys about how it sucks to buy Bitcoins quickly with all this ID check, then sent money from your bank to your BTC Account, buy them. All in all it takes 5-10 days to buy a Bitcoin if you never did before. Way too long to buy quickly something. On Black Friday many people were pissed that there is no other alternative payment method then BTC to buy that offer.

Why ever should somebody do this, only to pay things with BTC?

And then there is the security problem. The more the price raises, the more morons try to steal BTCs from others. Oh and the paper wallet! Well, I´m in Computers for over 20 years now but I really dont get it how to safely bring your Bitcoins on paper. And actually, letting them on Mtgox or on my Wallet on the PC does not feel good at all. And then, you need x backups.