PS3 gamers buy more used games, because their console is soo asspensive they can't afford new. Because the VGC tie ratio doesn't take account of the used game market the tie ratio is low.
PS3 owners are used to, and want "free" stuff, whereas Xbox 360 owners love to throw money at any coporation who puts content on their console, as well as throwing money at theior console (XBLG). So PSN+ subscribers basically never need to buy a retail game ever because they get all their gaming satisfaction through DL (full retail) games off PSN for "free". PSN sales of full retail games are also not recorded in the tie ratio, and because there are millions of PSN+ subscribers that's millions of full retail games being DL'd ever month that are not recorded as sales.
Hence the true tie ratio, taking ito account used games and PSN+ DL's may be fairly even.
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