If Google's over optimization penalty is caused when you are targeting a specific term too heavily...do you think this strategy could beat it or at least save some time? Instead of spending time building backlinks with related keywords and fluff keywords like "click here", "yourwebsiteDOTcom", etc. Could you simply purchase expiring domains in a similar niche as yourself and 301 redirect those domains to your money site, thus redirecting their keyword anchor texts as well? Lets say you find 5 websites related to your niche that each have 20-100 natural backlinks. If you were to 301 them to your money site would you get 100-500 natural-footprint anchor links to your site? If that would work, then you could spend a majority of your time building anchor links towards your money-keyword and then whenever you feel your keyword diversity is becoming unnatural, you could 301 a relevant domain towards your money site. Any feedback is appreciated.