This image shows what the layout looks like when rotated using the top-left pivot-point coordinates. If you wanted the layout rotating around a main character, the display would get messed up because the character is no longer in the middle.
<img src="http://www.freewebs.com/jonnymataza/scirra/rotate1.png">
This image shows the display being rotated with a central (customizable?) pivot-point. If a character is supposed to be centered in the display, they stay centered as the layout rotates.
<img src="http://www.freewebs.com/jonnymataza/scirra/rotate2.png">
I hope this helps clarify <img src="{SMILIES_PATH}/icon_biggrin.gif" alt=":D" title="Very Happy" /> .