Also, like he said, don't complain, just deal with it. Saying they do nothing for you isn't entirely true, or you wouldn't have an app on the App Store.
I'm not complaining, but stating that I'm not happy with how things go. The only reason why it's "acceptable" to give Apple 30% is because they're the only game in town. If I gave another third party 30%, they surely had to bring a bit more to the table than what Apple is offering me (in my specific situation with a niche app).
If everybody shuts up, nothing will ever change – although expressing dissatisfaction probably won't change much either I guess.