I'll tell you guys what would be interesting: getting some merchants who ARE using Bitcoin to to tell us and explain why it works for them.
In particular, the merchant I have had the most experience with re buying with BTC is Provident Metals (providentmetals.com), who take BTC (among other payment methods). They charge about 1% more than the check or wire-transfer price, but less than credit card. My guess is that the 1% more is because they use Bitpay to accept the BTC and exchange it for cash to Provident. Perhaps also there is the risk of an adverse price movement within the 15 minute window they give you to pay (though that would average-out balanced by positive price moves in the 15 minutes).
I doubt that many merchants would tell us much, as they want to keep any successful methods secret. But, merchants who DO accept BTC and other payment methods would do us a great service explaining what works and what does not
But I can't see if that makes any significant difference
If Bitcoin still ends up converted to fiat somewhere down the line (or even up the line before it ever reaches the merchant, if we look from the merchant's point of view) via BitPay or some other payment processor service, as to me, it is essentially the same if you converted your bitcoins to fiat yourself and then used the proceeds to buy all the things which you (allegedly) buy for bitcoins now. I understand that it may be handy and convenient overall (when someone else converts your bitcoins to fiat instead of yourself), but what does it change in the grand scheme of things? Other than that, I don't see what particular difference it makes for the merchants themselves either, especially if they don't have to deal with Bitcoin as such. The payment processor does everything, but that's just their business