Sadly there is no killer feature in Bitcoin for average Joe. I would like to see a merchant that say : "Because of Bitcoins I'm saving on transaction cost. I give 1% rebate to every transaction made with Bitcoin."
Right now love it or not, it's a lot more simple to use Paypal.
Because of Bitcoin, I'm saving lots of money and headaches on each and every transaction. I won't sell for anything else at BitBrew and offer great prices for a premium product.
-edd