No!
I think I should expand on that 🙂
I've never cared for SEO or marketing because all of the forums I've ever owned have had a captive market for one reason or another. I've had a number of totally unique niches e.g. a forum dedicated to a particular guitar made in the early 80's. The forum is hidden, by invitation only and yet we get thousands of referrals a year.
The customer service forums I run are officially authorized by my clients so there's no competition and no need for promotion.
Forum SEO has always fascinated me because the forums that appear to push it to the max are often the hardest to register on and the least friendly if you do finally manage to fight your way past unanswerable questions and the CAPTCHA. I've seen 'use the search' and 'start your own thread' in answer to a member's first post so many times on these types of forums I think they must be all using the same script on how to run a successful forum.
Of course SEO and marketing has a major place on the Internet but most modern forum software does a pretty good job of SEO and marketing has to coincide with ease of use.