You also realise they're all from one label, right?
No, it's a question of when the labels and Apple agree terms. One of the reasons the labels are supporting Amazon is to improve their bargaining positon.
No, that's not why at all. It's to do with the avoidance of a distribution monopoly and creating favourable marketing conditions.
The people want digital downloads, that's not necessarily the same thing.
1. No, they are from hundreds (thousands?) of labels. Just not a few major ones. That's not a small problem, but there IS tons of solid non-DRMed content on iTunes. Stop listening to the crap Sony/BMG puts out
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2. We have no idea how much Amazon has sold, but I have the feeling it's not a ton. Maybe in a few years they will take a bite out of iTunes. Maybe more than a few years. Are the big labels really going to blow off years extra revenue in the #1 music store for the sake of a bargaining position? I don't think they will. Moreover, they have little legitimate bargaining position. Is it "flexible pricing" they are after? iTunes clearly already allows this for album prices, and Amazon single prices are 99 cents OR LESS. The big labels have no goal but to decrease Apple's market share... alas, in a year, Apple has gone from #3 to #2 to #1, even while Amazon was around. So the labels lost their gambit, are losing revenue, and all for no discernible reason. I think their abstention from iTunes Plus will not last much longer.
3. People want "digital downloads" -- well theyve had a ton of options for years (do I have to go over them all?), including WalMart. Some were even DRM free. And yet people still chose iTunes. With 128kbps AAC. And DRM. iPods drove much of that away from WMA-stores, but people chose that too. Why would people forego cheaper WMA players and stores for the pricer iPod/iTunes? People wanted that seamless, integrated hardware/software experience. That desire for seamless integration extends to digital purchases -- people want to click Store, hit Buy, and be done with it. You can't argue with #1. Amazon offers a compelling product, but it is a hideous user experience, and does not have the appearance of integration (even though the Downloader helps achieve integration). I have a feeling Amazon's sales are mostly from techies who know what a bitrate is, know what DRM is, and aren't afraid to use downloader/importer software to have their files traverse the web to desktop to iTunes to iPod. For the other 99% of the population, there's iTunes -- and the big labels would do well to suck it up, join the party, and MAKE SOME MORE MONEY.