It sounds reasonable, if this were a normal add on. I think Nintendo is going to start pushing 3rd parties to use the wii motion plus, and that won't work if the first 40 million wii owners don't have one. If your math is right, then I would expect it to go for $10 (Nintendo would forgo profit, and let retailers keep whatever discount Nintendo is getting for ordering tens of millions of them)

And of course Nintendo will push them through every other channel them can manage as well, including packing them in with Wiis, wiimotes, and the first dozen games that use it.

I originally assumed that the cost would be 3$*$1, but the following line in the artical made me think they were counting the +ve/-ve axes separately.

That six axis motion controller experience is exactly what Nintendo was after with the deal, which has had InvenSense providing millions of the chips in preparation for the spring launch of the peripheral.

However, now I think that you (and my initial feeling) were right.  I think the above statement (which was not a quote) ment to say "six degrees of freedom motion controller experience" which would be obtained with the gyros in the WM+ and the accelerometers in the original controller.

http://www.invensense.com/products/idg_600.html

•  Integrated X- and Y-axis gyro on a single chip

InvenSense's product page (and the original article) state the IDG 600 is a dual-axis gyro which would indicate each chip is approx $2.  This leaves out the 3rd axis which would mean the WM+ would need 2 of these chips raising the cost to $4 in InvenSense's chips.  So it may be possible to have a MSRP of $15 although I'm still leaning towards $20.

This makes sense. I am banking on it being $20. If it is anything less or more I would be quite surprised.

I think I remember reading somewhere that WMP was going to have three of these gyros. Wish I could remember where I saw that. They may have opted for 3 to achieve better accuracy or redundancy in case of failure.

Nintendo is known to rip consumers off in the pursuit of ever greater profits. Both the nunchuck and wiimote are necessary for 90% of hardcore games yet their combined cost is higher than any other first party controller of competitive systems. Heck, look at Nintendo's profit margin in Europe and you come to realize that a greedy company like Nintendo will milk every last cent out of this attachment.

$20 is very reasonable.

Still crying from the ass kicking the PS3(or is it the 360?) is receiving uh? Get over it you big baby, or at least go cries somewhere else. Hmmm, if a fanbody cries in an empty forest, do he make a sound, and really, should we give a sh*t?

15$ is probably the lowest we can expect one those I think, even if Nintendo decide to 0 profit from them. What I really want though, is a WM+ mote, I hate attachment on a gamepad, I hated it back in the N64 era and I still hate it today. Don't care much about the price.

@DTG: Get a hobby, seriously. You are sad.

Yeah, it must suck to have a business model that works. To sell software/hardware AND make a profit.

I'm guessing $20/unit - and it will be bundled with various games for $10 extra, and there may well be a Wiimote+Motion+ "all in one" (i.e. both units in one retail box) for $10 more than a Wiimote at some point.