Well yes, there is room at the middle. It's just that the bottom starts at 7. 9 and 10 is the new middle. Our Amps now go up to 12 at the top, and even still it's only the top of the middle. The real top is the race-stock, and unabashed big-mountian free-ride ripper skis.
As I see it, Middle is level 7-8, Bottom is level 5-6. Below that it's rent for two or three days. RX8 is a middle ski. AMC 76, 73, 79 are middle skis. Head Monster 72, 77, 88s are middle skis. Elan Speedwave 12, Nordica speed Machine 14, 14.2, 12.2 are middle skis. Nordica Mach3 is a middle ski.
As I see it if you are a level 7 skier wanting to improve you should be looking at a mid-level ski. Of course, that's just my opinion.