The reasons for non-response are myriad. Primarily, though, the folks that you really want to respond - Indie, Directorik, M
lesemann and quite a few others - are working professionals. As you should know as a musician and filmmaker yourself, the work is all-consuming. Besides putting in 50-60-70-80 hours a week at our chosen passions, plus spending time marketing ourselves and the business aspects of our profession, we also have real lives - significant others, children, parents, laundry, food shopping, cleaning our homes, spending an evening paying bills, health issues, etc. And guess what? We also need time to decompress, enjoy ourselves and recharge the batteries.
It is all too common for people to join this forum looking for positive feedback on their projects, and, getting honest criticism, get huffy and never return - the hit and run posters who want us to "critique my 100 page script," critique my first 130 minute movie," ad nauseam. We just don't have the time; we could spend all of our time answering pathetic wannabes and never get out own work done and living the rest of our lives. Hence we now tend to reserve our precious spare moments for those who are real members of our community, not casual visitors. We, as working professionals, are more than happy to share our knowledge and experience with those who share our passions, but have become very leery of the multitude of time-wasters who constantly come to this site.
As mentioned in the previous above posts, stick around and participate; that's what being a member of a community is all about.