I would kindly ask you not to presume things about other people. There are many reasons as to one would play on emulators instead of on the actual consoles, the main one being that Emulators provide a better playing experience. And there are many ways to do so legally as well. Every single console that uses DVD's and CD's can have their native game-discs play on emulators through a DVD drive. It's quite easy to play your whole library on the PC, and have the native textures of PS2, Wii and Gamecube games upscaled to play your games in HD.
And no, often people should not have to rebuy their games when moving on to a new console, and frankly, Sony should not be charging people to be able to play games they already own.
Please be careful when downloading in the internet, anything that claims to be a fully functional PS3 emulator is a fake, and also likely a virus. Since the only currently working PS3 emulator is very early in it's development, and can only play Disgaea 4 decently at the moment.