microsoft also had high market power in the personal computing device OS market and was using it to promote their entry into another market. they tried to argue that Internet Explorer was a part of the operating system and they might have gotten away with that argument if not for the language in the OEM contracts that IE had to be installed (as opposed to was built into the OS installation) and no other browser could be installed. that's where they screwed themselves.
Apple hasn't been determined to be a market of its own. so they are part of the same personal computing device market as Microsoft, HP, Google, Samsung etc. and when considered as a whole, Apple may not have the market power to be considered a legal issue. especially when the issue is software for their systems.
now that said, I do agree that 30% is a tad high, even 15% is a bit high for those recurring subscriptions. it makes Apple look greedy. drop it down to 20% and 10% or even 15% and 10% and it's a bit more reasonable.
as for the 99 cents and $99 developer fee. frankly I don't see how anything under 99 cents is worth it, unless it's limited to IAP. and okay perhaps the $99 is a tad high. maybe scale it for the number of apps you are submitting. $49 for your first 3 and then $99 if you want to do more. especially if they keep the sales percent thing at 30%
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i'm curious what are their commissions