I check that, for a long time we aggregate products over rss feeds of online shops and put in one Rss news directory. With five clicks - 100 products in example. At low price we bring products of online stores top ranking in search engines. OK, but this is not all, by high difficult keywords this help too, in 5 from 6 examples sites have moved 20-40% higher in serp. What is your opinion about this seo tricks? And think you this trick help by keywords like properties, loans and Similar difficult keyphrases? Excuse my bad english.
its a good idea to import the feed from blog to the main page or somewhere else. not only it gives your blog some additional visitors, it works well for seo as well as the page where you import the feed to gets seo advantage due to fresh content
Against duplicate content: Aggregated content is 30% of content on page 40% is navigation, header, footer 30% percent is related content - with random rotation of related news (spinner).