Kollywood Vs Hollywood

Though the topic has been talked upon left/right/center by most of the South Indian Film Critics and the title being very familiar to most of us, I wanted to write down something which I feel.

What is THE most important factor which differentiates Hollywood movies from Kollywood Movies?

Hollywood - The heroes are chosen for the stories.
Kollywood - The stories are chosen for heroes.

In kollywood, the value for stars is so much than for a story. One more problem is that if one storyline clicks, then there is a series of movies on the same line.

The moviemakers are not the only ones to be blamed in this. Apart from the trend being followed by the moviemakers, most of these decisions are forced to be made by the moviegoers too. Is'nt it?