I think 30% has been ridiculously high although I don’t know what a fairer margin is. For what it’s worth Apple has managed to maintain a 30% profit margin (not just sales) on the hardware they sell which is unheard of in the consumer electronics industry (everyone else is struggling to just barely make money in phones and mostly losing while others are taking a much more modest cut in other categories). Partly it’s branding. Partly it’s savvy business practices. Partly it’s immoral business practices.