I bought ~10 guest posts on high quality websites (engadget, blogher, huffington etc.) in the last 3-4 weeks for an old forum with thousands of posts . I did not see any serious effects on an that forum yet. I think I can tell that the website is an authority forum. I was not doing any SEO on that forum for 3 years and the traffic decreased to 1/10 of its highest in that period (so it has a good potential). Now I am trying to recover from that situation as fast as possible. I was expecting a kind of jump in terms of SERP movements but I did not see anything major yet. Am I expecting effects too early? What is your experience on high quality guest posts? When do you see effects? Or shouldn't I expect any serious effects from these guest posts?