The absolutlty only reason for not using ogg vorbis is that most portable players don't use it yet....

Now the other point is that you can't convert FROM MP3 to ogg and get better sound quality. It needs to be encoded as ogg to be useful.

MP3 is pretty entrenched and standard, and there will need to be some overriding reason for most folks to switch or bother at all......I really don't have the ears to 'hear' the better quality sound that can be measured and that others can hear.....(which also means, I CAN convert MP3 to ogg and vice versa and barely notice the difference, so I can do whatever is convenient)