I run an Adult niche forum that gets fairly decent traffic. I am trying to branch out into other avenues such as starting a virtual cam studio, creating new forums, and adding an Amazon store. I am wondering if I should add a store as a sub-domain such as: store dot mysite dot com, or if I should get a new domain and try to not just push traffic from my sites, but also rank keywords and try to get organic traffic as well? The reason I like the sub-domain idea is that it's easy, and I think my members would make purchases if they knew it would support the site. I am wondering though how it might effect SEO and if I would be missing out on a lot of organic traffic. The store wouldn't be particularly focused on my niche.