I don't understand why people have a hard time thinking that this could actually happen.
it wasn't that long ago that nintendo actually sold flash carts for the super famicom and you purchased games in lawson's and 7-11 in japan. you purchased the cart and could load upwards of 6 games on the cartridge (depending on game size) and could then have the cartridge erased and reloaded with other titles for a small percentage of what full priced games cost (back then).
nintendo offered many older back-catalogue titles as well as a few that were exclusive to the download program (like nintendo picross vols. 1-7). in fact, I've still got the one that I had a friend purchase in japan for me.
i'm glad someone knew about this. they did this with gameboy too ... my oldest kid still has his official Gameboy flashcart. (he's full japanese, from my wife's first marriage)