I think post counts in OMNI and OMNI P/R should count, in part because OMNI fluff especially is similar to many of the lounge threads.
As a compromise, I believe someone currently on TalkBoard suggested reorganizing OMNI by adding at least one additional sub-forum, and counting posts in some of the subforums, but not all. I can't find the post, but I believe the suggestion was something like, "OMNI-fluff-posts count, OMNI Games (new subforum)--posts don't count, OMNI P/R--posts count (or not).
While I'd favor posts counting in all of OMNI, I think the above would be a compromise that could address at least some of the issues and some of the concerns those that are against counting OMNI posts have.