Digital Download format for Burning Crusade

The new upcoming expansion for World of Warcraft,
the Burning Crusade, may be avaliable for digital download. This would
keep you from having to enter the real world to actually purchase the
expansion game!...

"Although nothing's set in stone, the availability of the original
WoW client via digital distribution in North America (also under
consideration for Europe) suggests that Blizzard will follow this route
with The Burning Crusade - although Pearce explained that relationships
with traditional retail are "really important" to the developer. " -
http://www.computerandvideogames.com/article.php?id=146430

But personally if I'm paying $40-50 for an upgrade I'd like to have
the nice little box and manual to go along with it. If I buy a game
these days its rare... and WoW is one game thats worth buying IMHO.

What do you think? Would you buy it as a digital download or in store? What if you could save $10 buying it as a download?

- TD