I would think that if anybody says no to this question, they're writing for the wrong reasons, and their chances of being published are less than someone who writes for the pure passion and love of it. In art, and writing is an art form, don't you think that people must have a passion for what they're doing?
I used to dance. For 15 years, I competed in regional and national competitions under a bunch of genres. When you saw someone up on stage dancing without passion - technically they were a genious maybe, but they didn't light up the stage, they were missing that...UMPH - you could see it! And that person inevitably would not win. They were missing an energy, a purpose in their movements.
I feel that writing would be that way too.
Besides that, from what I hear writing is not necessarily a lucrative occupation, so why would anyone write just for the money?
I have been writing since I knew how to write. I will keep writing whether or not I get published, whether or not anyone reads it. If I never get published, I will probably self-publish so I can hold the finished product, cover and all, in my hands. But I will keep writing. I've always loved manipulating the English language, using it to express my thoughts and feelings, yearnings, joys, and pains. And I always will.