I found an expired domain with PR4, 888 backlinks and is only $12. the domain name has nothing to do with my niche. Also the backlinks are all referring to skin care products which is NOT what my niche is in. Does this matter? Should I buy the domain, put wordpress on it and add content related to my niche and put a backlink to my money site? Will that boost my ranking for my money site? If so, is this the simple strategy i should follow. Buy High PR cheap websites that don't have spam backlinks?