Some people write music in order to communicate something to others - to
express something. There has been music written for 'patriotic' reasons,
religious reasons, love songs, rabble-rousing, etc.
If a composer wants something to be understood from his work, sometimes
it may follow that he would like people to choose to listen to it.
Or maybe he wants to get paid!
Personally I feel the same as James ('Personally, I make what I enjoy
making'), *and* the same as Carlo ('The reaction I want from people is:
"MAAAAAAN that's so cool why can't the sucker produce as fast as I can
listen? MORE MORE MORE!!!!"').
Maybe I expect too much...