I remember a quote from chiefblackhammer. A poem of the month contest was coming to an end and clearly he didn't like the outcome. He said "A majority of the serious writers aren't even on this site any more or didn't bother entering."
That was a damn un appreciative thing to say to those who had stayed on. People such as yourself who kept participating and receiverofhell, and starfire1036, and holderofadarkchalice. They insulted people who competed, it is no wonder fewer people participated after that.
Another issue that is no ones fault is that when people competed on other sites they would do searches to prevent plagiarism. This resulted in people having to explain that we went by different names on other sites. It got very confusing.
I used to compete in that forum and stopped. I didn't like saving my best up for the contest, and in general I had won enough that I felt it was time to step aside and let others have fun. The same group every time could get a little boring after awhile.