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DA is a third-party metric from outdated company MOZ and has nothing to do with Google's algo (secret of course). Also, DA can easily be faked.
Top sites can't send you big traffic unless you have a very attractive big banner. Guys watching porn, not searching for sidebar links. Header links can bring some traffic, but in most cases, it is site-wide - millions of links = spam.
As for backlinks for SEO - you need to check backlinks manually - with experience - it is worth it. Also, traffic to the linking sites does not bring any rankings to you site by itself, but the link from a zero traffic site = that site can have a hit of Google penalty and link juice is in question from it.
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