1. This is true of leagues in general. In fact there are houses that oil every day at 4-5 o'clock to be ready for the leagues at 6 o'clock, leaving the juniors a harder, beat-up shot.
2. Kids under 16 don't pay the bills anyway.
3. Kids still growing shouldn't be using more than one ball anyway.
4. Depends on the league type and rules. There are events to bowl in that are very competitive.
5. This is mostly true. Junior leagues give out lots of trophies to make sure everyone gets a trophy, which delutes the value of them all. Throphies that represent an actual accomplishment that someone worked hard for I'm sure are valued by the receiver.
6. College tournaments and PBA regionals bowl very early. Get used to it.
7. Juniors have high school bowling (not all states), college bowling (not restricted to juniors), and more traveling leagues. The typical saturday morning junior league is the equivalent of an adult mixed league, which may be the cause of your frustration. However, the majority of all leagues are mixed leagues that aren't for competition, so I think it's fitting that the Saturday morning junior league stay mixed, handicapped, instructional, and designed to attract and keep new bowlers into the sport.