You hit the nail on the head. The basket-weaving community can support those interested in that with a b.w. token. Thus, each time an upvote is given, one will earn SP/SBD AND BW.

That is the entire idea behind "Tribes" that the team is working on. They want to give communities the opportunity to create a website and have different social media functions (blogging, live stream, video, forum) all under one umbrella.