As usual I think the intellectuals in the community are over analyzing what is clearly a (Sling Blade reference) "It ain't got no gas in it"

It's only being used as a store of value because -> Merchants at large don't take it.
Merchants don't take it because -> the currency risk associated with a volatile commodity with no instant means of transfer into the fiat of your choice.
There's no means to transfer it into the fiat of your choice instantly because -> IT GOES AGAINST THE PLAN MAN!!!

In the end for bitcoin to move through this growing pain and reach adolescence someone (possibly coinseter.com) will have to give merchants the security of knowing they can instantly exchange the bitcoins received into fiat in their bank to pay overhead. At least until it reaches adulthood and they can pay their expenses in bitcoin.