a competitor is ranking using this method. his domain used to be a legit site belonging to a scientific community. Therefore, it gained high value links from forbes, huffington post, and also some .edu he bought the domain and made it his money site. he also built some backlinks but nothing of high value. now he is ranking for a competitive keyword. here, usually people discourage using old sites as your money site. I have also tried to experiment with this once and the site didn't rank. but this guy must be doing something right because he is ranking. The old domain has absolutely nothing to do with the topic of the new domain. any ideas?