To be honest, I don't know why it's a problem. I know I have had my fair share of 0-voting complaints in the past, but lately I've just thought nothing about it.
It's a vote, if you can advertise your music enough (in the right directions) then people will review your music, and let the reviews determine whether or not your music is great, and pay no attention to the votes.
Infact, heheh, sometimes I consider 0-votes as a compliment. You should too, because listening to your music mate, you know very well that you've put in too much effort to get 0 voted for crappiness, it's because people are so impressed by your music that they are too jealous to let it get noticed.