Let me ask you this- did you post your rough works and their evolutions when you first started, then later only posted finished maps? I ask because a similar thing has happend to me over on the paper-cardstock modeling forums. I can start a thread about a model that I just started and I might get dozens of replys, encouragment, and advice, but when I post only image of a finish model, I often will only get 2-3 of the die hards saying "Great job".
I think people like to "go along for the ride" and will get more involved and interested if you start posting to the forums at the beginning of a project as opposed to the end.
Just my 25 cents.