Hello Friends, i have done seo of some sites near two year before, in those two year we are not doing seo of these sites but these sites are still have good serp on its Niche keywords. so my question is one time seo is remain whole life, they need not any seo after one time ?
I am not sure to what extend is your SEO for this site that you say nothing has been done and yet the serp remains (presuming Google page 1?). I would really be surprised that no onsite or offsite seo including backlink building for the last 2 years and yet it performs so well. If so then there is absolutely no competition. But I wonder how long this will last though because Google likes to see fresh content on websites.
You must start the SEO work again. Today you may have good SERP, but in future this may not be. Because if your competitors are doing promotion, they can occupy your position in search results and you may left behind
[edited by: mademetop at 6:57 am (utc) on Jul 14, 2010] [edit reason] Promotional links removed [/edit]