Cycling Bikes For Sale

What is the point of an aftermarket exhaust on a sport bike?

I am looking at buying a used sport bike (GSX-R600 or 750) and a couple I am looking at come with after-market Yoshimura exhaust pipes. Is there any reason to pay more for the bike because of this? I know it changes the sound of the bike, but I don't really care about the sound so what's the point?
Seller of bike says the yosh exhaust cost him $1,000 new

Most sport bike riders only put them on for sound, BUT....if they are coupled with a hi-flo air cleaner and properly jetted(carbed bikes) or have a Power Commander or similar fuel injection controller and PROPERLY tuned....will produce more horsepower and torque.....
Note that I said PROPERLY tuned.....JUST adding a muffler alone does not do much at all except make it louder.

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