Here's the press release I was talking about:
http://www.nintendo.com/whatsnew/detail/AZ0OEYjv_m0VrVAke1-qbmNDv71evaNg
"Through the end of August, Wii Sports Resort has already sold more than 1.25 million units in the United States alone, according to the NPD Group. Nearly 2.9 million Wii MotionPlus accessories are in the hands of the public. That includes all those sold with Wii Sports Resort, standalone sales of 1.36 million and an additional 257,000 bundled with Tiger Woods PGA TOUR 10. "
As Demotruk says, we can't be sure that the 2:1 ratio will persist, but more and more WM+ bundles keep popping up. There's the NHL2K10 bundle and a new WSR bundle with two WM+ dongles. Take the 2:1 ratio as a guideline rather than gospel.
Also, this release only pertains to the US region. Other regions might be more or less keen to buy additional WM+ dongles.
"The worst part about these reviews is they are [subjective]--and their scores often depend on how drunk you got the media at a Street Fighter event." — Mona Hamilton, Capcom Senior VP of Marketing
*Image indefinitely borrowed from BrainBoxLtd without his consent.
