There's one more aspect to it. People may want higher bitrate audio simply because it's better in theory. Even if they are not sure they can tell the difference, they might want the best possible music quality as a matter of principle.
When people make purchases, it's not always a purely scientific process. Many people buy iPods without considering whether they are really the best product for them. They see the ads, they hear the name, so they get one.
When they see "higher quality for 30% extra", they probably don't do their own "taste test" before choosing.
When people make purchases, it's not always a purely scientific process. Many people buy iPods without considering whether they are really the best product for them. They see the ads, they hear the name, so they get one.
When they see "higher quality for 30% extra", they probably don't do their own "taste test" before choosing.