Yes, the game is a pack-in with the Wii. So each time a Wii is sold, Wii Sports is being sold also. And another thing Wii Sports is not even a pack-in in Japan, but it sells extremely well on its own.
Wii Sports was a good game to get consumers to learn the Wii better at first hand. Nintendo did an excellent job providing this game with the Wii.
I still play this game and Wii Play even now. It's fun to play with friends and family members 8)