Elements for AJ authors

Hello, just wondering is there any criteria to become music contributor for envato elements. Every time when I ask that directly in support I get typical answer - we are not support new music authors for elements. Then every six months I find out that this or that author has been invited to be among the chosen ones in a closed procedure.

I admit that such ambiguity is very frustrating. Why not explain to the authors how to become a part of the elements?