So, imagine I have a website selling bricks publishing superb content on bricks in Norwegian (just an example). On tier two I have 10 WordPress sites feeding backlinks with good content about bricks in Norwegian. Then on tier 3 I have content barely passing Copyscape. Now, I can buy good content about bricks written in Kashubian (sorry, linguistics geek) for less. The blog will be presented as written by Kashubian bricklayers who live in Norway and connect to local issues. As a matter of fact, I can launch few such blogs in different languages on each tier. I can see few possible developments here: 1. a) Tier 3 Kashubian site propping tier 2 Norwegian site is less ROI efficient b) Equally efficient/more efficient than Tier 3 Norwegian site. 2. Tier 3 Kashubian site is only efficient if Tier 2 site is bilingual (Norwegian/Kashubian). This, however, translates to Tier 1 at the end. 3. Tier 3 Kashubian site is only efficient if Tier 2 and Tier 1 sites are bilingual and: a) Influences authority and ranking only in Kashubian SERP segment b) Influences rankings in Norwegian to some extent. c) multilingual websites are only useful in terms of SEO because of link building between different language versions of the content.