Is it just me, or is there practically *no* innovation in cases for the 600?

Let's look at the current designs...

1) "Horizonal" holster style (e.g., Covertec, Body Glove, Handspring)

2) "Vertical" holster style (e.g., what came in the box, but with some kind of clip mechanism)

3) "Vertical Flip" style (e.g., Vaja, Bellagio)

4) "Form fitting" style (e.g., Covertec, Bellagio, Handspring)

But this is it, right? All of the manufacturers basically make the same cases, the only difference might be in materials, quality, type of clip, etc.?

How come no one makes something truly unique?