People don't listen just because you have something worth hearing.
They listen because they trust you
They listen because someone they trust recommended you
They listen because their past experience of you makes listening worth the risk
There is so much noise going on that it is impossible to hear everything, or even everything worth listening to so the average person applies a filter.
So before you start getting annoyed that people aren't responding to what you are saying make sure they are listening.
Before you start getting annoyed that they are not listening make sure they are paying attention.
Before you start getting annoyed that they aren't paying attentions check to see if they trust you, have been recommended to you by someone they trust.
Julz Darroch at bigredball