WHY DQ isn't popular in America

Hello!Nice to meet you.
I'm a Japanese.
Well...I have a question.
Why the Dragonquest (In America it called DragonWarrior) isn't popular in America?
DragonQuest is most popular RPG in Japan (than finalfantasy).
It's wonder for me.
WHY?
Could you tell me your thinking(opinion?)about it?

Sorry,Poor English.

Because most American's don't play RPGs.  It's too much an intellectual investment for them, and most of them don't see games as something you play for a very long time or have to think much about.

I, on the other hand, love Dragon Quest.  My favorite being DQ V