GenerationBenz spent a fortune developing this rubbish. It gets very few discussions from very few members. It’s a huge failure…but it looks lovely.
This is a thriving community for the GolfGTI. It doubt it cost much. Which has 1.2m posts from 26,105 members. Probably the sort of size and activity you're looking for.
Now, it would seem common sense to follow the GolfGTI example. 1.2m posts –vs- about 20. Yet the majority of companies I speak with insist on the GenerationBenz approach.
So, for sure, add your branding, a custom layout, ask lots of questions before people join, include game mechanics, and anything else that fits in with your marketing plans. Just don’t be surprised when you end up with a GenerationBenz style community.