I think a lot of people are forgetting, this isn't meant to be the main "thing" for the PS3, it's an optional peripheral just like the PlaystationEye/EyeToy, which will be used in specific games tailored for it. It isn't meant to be going up against the Wii, since people buy the Wii for the games, or so I'd assume, whereas people will buy a PS3 for the games, and when a game comes out for the new PS3 they've just bought, or they find the games they've bought would work better with Move, they'll go and buy it.
People are comparing a peripheral to a console where the main selling point is motion control.
Now, if you were comparing it to Natal, I'd probably have other things to say, like, that WILL be a fair competition, since they're both peripherals going head to head.
If I had $100 (I'm British so that wouldn't happen too often, lol), and I saw PS Move, or for a little extra, I could buy a Wii with the Wiimote, it's quite obvious that I'd buy the Wii, especially if I didn't have a games console, but if I had a PS3 and had to choose, it'd be the PS Move. If I was new on the market but really wanted a PS3, I'd buy one, and if (I'm sure I said this before o.O), there's a game I'm looking forward to, which has PS Move capabilities, THAT'S when I'd buy it. I wouldn't buy it as a primary controller, but as an alternative option to playing the games I like.