I have an old iPod and no other interest in Apple products right now, but it's kind of stupid to say you would never buy one even if you think there's a principle to uphold. "Never" is a long time to commit to.
I didn't say I wouldn't based on principle but I don't see how principle wouldn't be a legitimate reason, if you really have a problem with the way a company does business it's only natural to avoid giving them your money isn't it?