Excellent suggestion by the SEO expert Big Red SEO. I would join him in advising the same.
People join communities today if they present quality content, contributions and the opportunity to benefit through advertising yourself. They aren't joining it because the forum is a "do-follow" site. Everyone is getting a relatively equal amount of exposure in a discussion.
If you are a web hosting company and a member of a forum, people are going to sign up with you when they notice your knowledge and helpfulness through contributions, not the volume of ads and not even the volume of posts (if most of them is fluff). There is no better advertising than to help someone with a great advice and/or practical solution. Its impact is much, much higher in terms of sales value.