Sony has just confirmed with us that PlayStation Move cannot support 4 players in its full configuration.
The complete experience of PlayStation Move requires two controllers per person, either two PlayStation Move wands or one wand and one sub (nunchuk-like) controller.
Our previous look was with the Wii MotionPlus, which clocked in at $80 per person to be fully equipped. That was $40 for the Wiimote, $20 for the Nunchuck and another $20 for the MotionPlus dongle. Now, you can get a WiiMote + MotionPlus bundle for $50, bringing the 1 person cost down to $70, factoring in the Nunchuck. For four people, assuming you didn't trash the bundled WiiMote and Nunchuck from your Wii console purchase, the cost would be $230.