User blog comment:Sentomaru/Are Devil Fruits too common?/@comment-3119203-20121022023712

I think that since Devil Fruit users are generally more powerful than normal people, they begin to seek greater glory and head towards the Grand Line, the plce where dreams are made and crushed. So it's not that Devil Fruits are more common on the Grand Line, but you have a greater convergence of people from all over the world who have these fruits. After all, if you have the power, why not use it?