As far as I know WSR is bundled with M+ everywhere since you can't play the game without it.
I live stateside, and at the time of WiiFit release, it was bundled with the balance board, because not only was it the only game to use it, but you can't play the game without it. If gamestop had a deal set up where you get a Wii + WiiFit bundle, then it was for people that didn't already have a Wii, as you can't play WiiFit without a Wii. I hardly think GS is gonna force someone that only wanted WiiFit (that comes with a balance board) to purchase a Wii at the same time. That makes no sense.
And by the way, WiiSports isn't a bundled game, it's a pack-in game. It comes free with the system.