While on a business trip, you buy (a) the WoW expansion and (b) a new mouse to play it with, as you left your travel mouse at home and find playing games with the trackpad on your laptop unsatisfying.
Amusingly, in the utterly anonymous shopping center where our hotel is, there’s an EB Games. EB was sold out, unless you’d thought to pre-order the expansion at this particular podunk pissant hole-in-the-wall shop. However, around the corner there is an Apple store.
The Apple store had a shelf full. Blizzard has, for most of its history, shipped Mac and PC versions of their games on the same day, and on the same media. We expect many folks have left the EB shop disappointed with no idea they could get their jollies just 100 yards away.