Probably because no one wants that second fiddle Mario on their cool, Luigi-branded 3DS.
Aside from the cool console, the bundle comes with Mario & Luigi: Dream Team installed and a 4GB SD card. If you don't have a 3DS, maybe you should buy this. There are a bunch of awesome games on it.
$150 for Mario & Luigi 3DS XL bundle [Tiny Cartridge]
Nintendo's big release schedule for Never Alone, Don't Starve, and lots of other indies
12:45 PM on 03.04.2015