Speaking as an AJ Author here;
I did notice a trend in sales when being active in the forums; Asking for feedback, and posting in "item requests" posts where buyers ask for certain styles/genres/moods and people post tracks their tracks that they may be interested in. You are also allowed to help other authors with their work in the item discussion. Buyers frequently browse the forums as much as the authors do.
It also helps to have content uploaded every couple of weeks, it helps put you on the "Newest items" page for a day or so, leading to more buyers.
Buyers usually come back for more, so if you are pretty active in uploading quality content, they will easily be drawn to your profile more than once.
I think that these contests really draw in a lot of attention from commercial buyers, and it really would be in your best interest to at least enter to boost sales.
There's a thread about sales trends, buying patterns and other related topics here:
Hope this helps, and if any of you need help with anything related to AJ, feel free to ask me :)