It's strictly due to the amount of spam the forum receives on a daily basis. The pre-moderation just ensures that posts are on-topic. If we didn't have it, there would be an incredible amount of forum spam about drugs, viagra, pr0n and other junk. (Not saying that there isn't a place for drugs, viagra and pr0n, just that it ain't here. ^_^)
We like all feedback, positive and negative. We only have a few simple rules (treat other members with respect, no flaming/trolling, and do not discuss other companies in a negative manner). Constructive criticism is appreciated.
Thanks for asking...
pax,
_Chris