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well today i m searching for some
affiliate sites related to health niche
and while browsing i found lots of
one page wordpress websites which
have only product description and
policy page.when i checked their url
in open site explorer their DA and PA
are only under 15/100 and root
domain is only 2 and yet they are
ranking to top for the buyer keyword
so i want to know is there any
chance of outranking them from
their position.

Yes You can out rank those sites. May be they are ranking because no other marketer targeted that keyword. Check DA and PA of other ranking pages and you will get the point :)

The sites could be using negative SEO to pull down sites with better metrics.

well i checked upto 2 pages of google search and no site targeted the buyer keywords and in open site explorer there DA/PA are under 15-20 and root domain are 2.u dont believe in few niches youtube videos are on top postions whose root domain are 0.so now i m going to make a simple one page site hosted on blogger having just 4 pages like main review ,testimonial,youtube video of product and privacy policy and this is also hint for u how you can earn from a simple site.