Why is it important for a high trafficked internet portal to have an SEO strategy? How much can SEO influence traffic in this case?
may be they have high traffic because they did SEO in the past? SEO means optimizing your site for search engine which in turn means search engine traffic. and when it comes to traffic, you can never have too much
May be with no seo strategy, they must have got the traffic due to quality content and unintentional seo being done. It is great if the site/portal gets traffic with no particular seo strategy bring followed. But however high the traffic is at this stage, there is always a chance of getting your SERP hijacked by a competitor who follows great seo techniques and a strategy for a long term.