Apple had a meeting with a bunch of smaller lables and told them that they were (initially) only extending the ability to distribute through iTMS to 40 or so companies. CDBaby can charge you because there is no direct way to get your music to iTMS without going through *one* of those 40. Limited access means the ability to charge for it even if they don't really do anything.
But yes as you point out they give you no marketing or advertising for your $40 + 9% just access.
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But yes as you point out they give you no marketing or advertising for your $40 + 9% just access.