'Twilight' ... why is it so damn popular?

Everyone has heard of it, many have read it and many more have seen the films.  Everyone seems to have a view on it, whether they have read it or not.  Almost all forums on the Internet have a thread that argues its merits or denounces it.  But, one thing that cannot be denied is that Twilight has been hugely popular and has made Stephanie Meyer very wealthy indeed - according to Forbes richest celebrity list Meyer comes in at number 26, in between Simon Cowell and Roger Federer.

Twilight (The Twilight Saga, Book 1)