I'd happily pay a premium to be able to buy things in BTC over USD to support the Bitcoin economy and encourage buyers and sellers.
Wouldn't you be supporting the bitcoin economy by exchanging your bitcoins for dollars, and buying two Pies instead of one?
Also, what if I did not want anyone to know I bought a Pi?
I was able to PGP encrypt the message and pay with Bitcoin. This way, no one knew I was even interested or in the process of purchasing one.
If I used my credit card, or at the store, many paper trails would exist.
True, but I can't imagine a scenario where those benefits of Bitcoin necessitate paying double the price for something like a Pi.