Same here. PC is a huge hassle. I'm so glad it isn't the only thing I have. I like it for what I use it for, but I feel really bad for the people who only have PC and have no idea what they're missing on console in terms of exclusives. Especially PS4 exclusives. They'll probably get PCSX4 someday though.
Unlike Xbox 360, PS3 wasn't X86 architecture like Xbox One and PS4 are. Not to mention, Ps3's architecture was notorious difficult to program for, and unique to anything around at the time. It was brutal for some just to create ports of games on that architecture. Do you have any idea how difficult it would be to getting a PS3 emulator even running? Let alone at acceptable framerates. Why do you think there's no PS3 emulators on PC that work? Emulator's by their very nature are inefficient. PS4 is only about 8 times more powerful than PS3
PS3 backwards compatibility will never happen on PS4, probably not even on PS5.
And Sony doesn't need to bother because not only are they way in the lead right now but they also have plenty of exclusives for people to play. Plus they'd probably charge unfair prices for PS3 games anyways and barely release any. Just like they have with the PS2 games on PS4