I find addon domains really confusing. Everyone I've asked so far says that they don't affect SEO but I find that really hard to believe considering the same content is on both a subdomain and a subfolder and also has it's own unique domain. PLUS (in my case) completely different niche sites are sharing the same hosting. I really don't want to pay for hosting for all of my different sites but at the same time, if it's better/safer to do so for Panda/Penguin reasons I'm happy to do that. Thank you for your time. I look forward to your opinions/suggestions!