For example, I wrote this hub page called Frugal but safe traveling in Los Angeles. I have yet to get a complaint on the accuracy of it. I don't live in LA, and I've only taken two trips there. Does it sound like I have much business writing such an article?
I once wrote a hub page called 'There needs to be TALL wheel chairs' (so people in wheelchairs could speak to non-handicapped eye to eye and feel better about themselves.) I am not in a wheelchair, I don't know anyone who's like that, nor do I have a degree in anything like psychology. Yet, I wrote it anyways because it gives me something to write about.
Bonus: Do you ever market affiliate products which you have no interest in yourself / have never tried / never would?