Now that the Wii has SD card support, any game on the system could technically be made available as a download, since you could fit several DVD Wii games onto a 32gb SD card.
So that got me wondering, what if Nintendo offered Super Mario Galaxy 2 for $40 via download instead of $50 for the retail disc, would you do it?
If for $40 isn't low enough, what if it was only $30 (savings of $20) but you had to have the first Mario Galaxy disc inserted for assets?
If Mario Galaxy wouldn't entice you to do this, how about if High Voltage did the same scenario with the Grinder? Only $30 for the full Grinder game via digital download, but you need to have the Conduit disc to play it.