Every answer is an extention of a person, their thoughts, ideas, and their being. What may be pointless to one, will have some meaning to another and perhaps some deep meaning to even another.
Some people read the bible and think it is a bunch of garbage, other's read it and it changes their life - and God wrote it. So unless you can write better than God.... get my point?
I would worry more about certain elements, or words within my writing that may be pointless, rather than whether the whole of my writing is pointless.
You see writing as self-serving. Is the rain self serving because it falls where it will? Does not a wealth of life benefit from the rain? There will be those who will find great benefit in what you have to say, and others who will give it a glance and think "eh" and move on. So what.
Write for yourself and to heck with what I think - or anyone else. That is where you will let down your mask and people will enjoy relating to and seeing the real you.