Well, that is a good 질문 that could entail many good answers. One of my reasonings is that the book became a personal attachment that was also familiar and embraced 의해 Millions of other people. "Common Threads" PULL people together. Then the "hype" begins! And when the book takes on a real life vision in the Movies. Now 당신 have a Phenomenon!!
Another "Plus" is that all of the Actors & 여배우 are HOT! ;D
Well, it's vampire romance. Some people don't actually watched Twilight cause 뱀파이어 don't interest them. And I watched tons vampire series and 영화 cause I 사랑 vampires! I'm die hard vampire lover.. And it seems that Twilight become romantic novel since Titanic. :P <3 Most of every people have their own interest about it. Like 또는 dislike vampires, don't actually watched romantic movies, 또는 prepare something like Harry Potter. I watch HP and Twilight cause they are different and are both popular. Even tho there will be different likes.. "Harry Potter's better than Twilight" 또는 "Twilight's better than Harry Potter" :X