Logic seems pretty good except...
More people own Wii's now than 360s, and its also less expensive than the 360. Therefore the 360 should be ahead of the wii by your logic.
The PS3 now isnt even really the most expensive, the 40gig is same price as the 20gig 360. The amazing games (finally), and added value of bluray are probably also reasons why its ahead.
Sony KDS-60A2000, Sony Playstation 1/2/3 (60gig) and PSP, Sony STR-DG910, Pioneer/Sony 7.1, 39 PS3 Games, 120 BR movies