People just aren't that interested in the PS3. They never have been. It's in its 7th year on the market, and just finally broke the 9M barrier. It has never sold more than 1.7M in any year, and only sold 1.2M last year, and will likely sell less than that again this year. It carved out a place for itself, but it has never been popular, and for much of its existence, it has been lukewarm at best.
It is what it is. I mean, the PS3 is a step up from the Gamecube, but the Cube had just as many million-sellers as the PS3 (and won't be far off the # of 500k sellers either when it is all said and done). The PS3 survived, but it never caught on.