Sony releases games, or remakes of games with better graphics and extended crap, for the PSP only. Why would I want a PSP if I have a PlayStation 2 or 3, just to play only one or two games that would have worked just as well on the console? Final Fantasy XIII is the only game on the PlayStation 3 I think would be worth playing, but I think hardly anyone would shell out $430 just for that.
The PlayStation 2 was by far the most popular console of the previous generation. When switch to another brand when buying a console from the current generation, like an Xbox 360 or a Wii, you get access to Xbox and Gamecube games because of backward compatibility, so it's like the game libraries are twice as large. This makes the PlayStation 3 library look even more minuscule by comparison.
Rather than get a PlayStation 3 to play FFXIII and whatever else is out there, I would just wait until 2019 when the PlayStation 4 or whatever they call it has been out for a few years and its price has dropped.
What hath Bob wrought?