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I'd say it's a direct result of there being so many Call of Duty and Halo titles on the system (a Halo fan already has five or six games by default, a CoD one has about seven) and the fact that, for most of the generation, multiplats were better on the 360 than on the PS3. That's been changing lately, but too late to make a real difference.

And I'd say the tie ratios decreased in an overall because much more people bought two or more platforms this gen than in the previous ones. And this generation had, by far, the most sales if you add up the three consoles. Wii was the winner in sales, but the other two only lose to it and the two PlayStations amongst all the home consoles.

I guess DS and PSP have relatively low tie ratios because plenty of people bought more than one of each, since both had many iterations. If you had 10 DS games and upgraded to a DSi, your tie ratio is now 5. Also, flash cards on DS and Memory Stick loading on PSP.