As others have said "what's the point of doing X on Y?"
The point is some people want to do it. Some people would like to do it out of curiosity, some people want to do it because they have other computers doing other stuff and would like to use their PS3 for open office, firefox or whatever.
You could also ask "what's the point of having card readers?" or "what's the point of having PS2 B/C on your PS3?" It was an option (and not easily or cheaply replaced like the card readers) and now it's not, it sucks. Why does it matter what people use it for?







