There are so many premium themes at such a low price that you are no longer permitted, have an ugly website more. More and more online companies will start selling awesome wordpress themes, and, together with the increase in premium theme services, as a way to get more customers (or for more traffic and then sell-advertising) will be some of these companies offer free premium themes, and I must admit, those are wonderful wp-themes!
Full list of Free Premium Quality WordPress Themes
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( Ali Han, URI:alihan.com.tr/blog )