Console sales is still the better measurement of success and the one they are not mentioning because they are still well behind Nintendo but closing the gap on Xbox.
Units sold ( just primary gaming consoles, does not include handhelds) as of 1-1-2011
Wii= 84.4 million
Xbox= 50.5 million
PS3 = 46.0 million
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As other have stated, PSN lets you set up multiple accounts for free.
Although I like PS3 better for all around features.