Don't be so quick to assume and take my post out of context.
Oops - I did not mean for my post to sound personal or negative. I apologize.
I agree that it is Apple's style to charge up front for service they provide later. Still, I find it refreshing, for in the UK most companies act in a mean-spirited short-sighted way that is infuriating. It winds up wasting a lot of money, resources, and time.
What Apple might give up in a modest price adjustment would more than be made up in volume. By deploying that type of strategy, Apple would not only be as successful and wealthy as today, they'd enjoy a much larger customer base. they'd be working with a business plan so strong, that slipping back would be extremely unlikely.
However I must not forget this is the USA, where instant gratification is worshipped at the highest levels.
I think the Genius or Apple assumed you are a registered developer. At any point, I think the last time betas were around, Apple Stores weren't taking in devices with a beta in them. Perhaps you got lucky.
I don't see how they have any grounds to refuse a replacement under the warranty because you're using a beta OS.
There's nothing in the warranty that states that would be excluded.
Yes it is in there. and repeated when you download the OS from the developer center.
Got lucky.
I would attribute this more to sympathy from the Genius than luck.
I think it's pretty stupid not to put iOS 6 on it before going to the Apple Store. Why would you take the risk? Seems stupid to me.