The main reason is QUALITY. We perform MP3 compression with professional algorithms that are not available in consumer software. Professional MP3 compression provides superior quality. Another reason would be CONVENIENCE.
"You took my 3 old reel to reel tapes, up to 30 years old, cleaned them up and made 3 great CD s from them. It was a special present to my wife and had to be good - and it was. Thanks."