We are always seeing stories - "Google slapped me" etc. because you went too far with black hat seo, maybe it took just one thing to get slapped. So why not build multiple sites in the same niche? You can experiment more too. This is something I am seriously thinking of doing. Making like 20 sites in the same niche. You can also repeat topics across sites without Google slapping you for having similar content on the one site. What do you think? Anyone here does this?