If I was to purchase Cataclysm as a digital download, I would download the game in advance, then play the minute Cata goes live, 7pm my time.
If I was to purchase Cataclysm from my local game store, I would queue up to buy the game the minute Cata goes live, 7pm my time. Then leave the store and drive home. Then install the game from the disc. Then download and apply the inevitable gigabyte of last-minute updates which have been added since the disc was pressed. And then play.
Cataclysm digital download = USD40 = ~$41
Cataclysm hard copy Australian RRP = $59.95
I welcome the digital age. Fuck Australia and fuck game stores -- from now on I live on the Internet.