Would a 3% discount be enough for you to buy with Bitcoins instead of PayPal or a credit card?

I'm interested because I'm considering adding Bitcoin buttons to an info products website. If I go to the expense of doing that, I want people to use them.

PizzaForCoins.com adds a BTC 0.03 surcharge (currently USD 5.45) to all orders. If BTC holders are willing to pay this kind of premium to use their Bitcoin, why shouldn't I do something similar?