Certainly it is worth it. It wouldn't matter to me in the least in which forum a member decides to hang.

I really would rather know that a member has been devoted enough to FT that they have (one way or another) managed to rack up 10,000 posts, than to not know anything about them at all.

Having said that, I am also very impressed with those folks who have been a constantly active part of the community for a decade, and still somehow managed to restrain themselves to the point where they have less than 500 or 1,000 posts.

Those two elements, join date and number of posts, work together to give us a glimpse of a member.