The forum software here is made by ASP Playground. It's not free and AFAIK runs on Windows servers, which cost more than Linux servers - my point being that if you want a forum that looks and works just like this one, it's going to come at a price.
By comparison, the
beyondcakewalk forum uses MyBB software and
sonarmods uses Simple Machines software - both of these are free forum software and probably running on low-cost Linux servers, so those forums are less expensive to run than this forum. Additionally, if enough people requested it those other forums could change themes and try to look more like this forum, but that's up to the individual forum owners.