The reason why a link back is necessary is very simple; The more links this directory gets, the more weight all links from here carries. Imagine that submitalink.net has got a PageRank of 6, wouldn't you want a free link from here? Of course, PageRank is not the only factor that matters. How many pages are indexed in search engines, what are positions for particular search queries, how high is traffic, and all related details are directly affected by how many web pages point to this directory!
A link from your website helps this directory to be better, to gain more traffic, to be more powerful! This is not just another web directory; It is hosted on a dedicated server, the domain was registered in July 2008, doesn't accept poor websites, and if something is modified, nothing affects active and pending links (inclduing, but not limiting to 301 redirects, new or deleted categories).
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