Please pretend you're the Blizzard CFO and you're about to pitch to the board of directors and shareholders on how the company should accept this new internet currency. What would the Blizzard explanation be for people who want to use bitcoins?
How would I pitch it? As a marketing instrument.
"There's a marketing opportunity that will reliably reach 100.000 geeks who are committed to using this new internet currency. They basically buy anything that can be bought with it. It will cost us a meager $10.000 to setup bitcoin payment and take us a week or two to do it. So this is low-cost, high potential reward. I think we should do it."
I would _not_ explain to the board how bitcoins work or how they could be acquired.
In order to successfully convince a merchant to accept bitcoin, it is not necessary to assume customers would go through the hassle of acquiring bitcoins specifically to buy something from that merchant (this excludes silkroad obviously). That is - quite frankly - highly unlikely as long as other payment options that are already used by the customer are offered.