Why would you want to do that? Question marks are what define our natural intuitiveness and is the benchmark of all conversations. If you eliminate question marks, then you eliminate all two way contact between yourself and those around you. Why would you want to do this unless you were insecure about your personality and want to take the pre-emptive action of ruling yourself out of conversations before others do so themselves.
I want everything I say to be a challenge to people. I want to make them think. When I eliminate question marks, they're forced to reconsider my words, their intent, their meaning, etc.