For anyone who has illegal music, it's paying once not twice and it's hardly expensive (cheaper than music subscription services).
For anyone who has non-iTunes music legally, given the cost of music, chances are that for most people the yearly fee will be very low compared to the rest of their collection, it's basically ~2-3 albums worth. At leat for anyone who has enough music to be worth using this for (if you own 5 CDs, just sync them once, why bother), $25 will be a small piece of what they've paid for the music.
For anyone who has non-iTunes music legally, given the cost of music, chances are that for most people the yearly fee will be very low compared to the rest of their collection, it's basically ~2-3 albums worth. At leat for anyone who has enough music to be worth using this for (if you own 5 CDs, just sync them once, why bother), $25 will be a small piece of what they've paid for the music.