It could be because the iPhone 6 is significantly larger. I've met lots of people who usually upgrade regularly but don't like the new design and are waiting it out. I personally wish I could still buy an iPhone 5S 64GB to upgrade from my 5.
You can use multiple accounts on iOS devices so you could still share apps. Wouldn't be quite as easy unless they are all sync'd from the same Mac in which case it really would be simple.
Incidentally as others have pointed out, you can turn off In-app purchasing in settings.
It was the 10th when I pre-ordered my 32GB iPad (3G + WiFi), although only just! When I started trying to order Apple still hadn't finished putting up the tariff details (in the UK). The data plans a bit disappointing I must admit.
Review is absolutely spot on. It feels unrefined but is fast. I suppose if I needed some quick info it would be good on 2G but otherwise I'll stick to Safari. However, the tabs feature is better and faster than Safari. Removing any animations does make it snappy but it instantly loses that iPhone feel.