So, you're arguing that there exists no other Apple internal rulebook than the arbitrary one that says 'apple decides'?Excuse me? I said nothing like that.
Yes, they probably have an internal rulebook but that's completely irrelevant because they chose to not disclose it. They are free to make that choice, just like you are free to not do business with them on these terms. It's called "Free Market", wikipedia can tell you more.
A one-sided contract is no contract, consideration is to be given to both parties
I'm starting to think you have serious reading comprehension problems.
The contract is not one-sided. You get to read it and you must agree to it.
Developing an application is an investment and you should be allowed to inspect the full terms of the contract under which you make your investment.
You are not only allowed to inspect the full terms, you are required to inspect and agree to the full terms.
The full terms are: Apple may or may not accept your application and they are not obliged to tell you any reasons for their decision.
If you think apple "should" be operating differently then don't do business with them.
You seem to think there is some sort of godgiven right to get into the App store. There is not. It is Apple's personal playground. If they choose to accept apps only on mondays then they are free to do so. If they choose to reject apps because they would compete with their own products then they are free to do so. If they choose to reject apps without even telling you the reason then they are free to do so.
They have this freedom because you, the developer, checked that little "I agree"-checkbox, remember?