Anchor Text links is becoming less important. In older days the rankings were based very heavily on anchor text rather than on-site optimisation .There are two types of SERP k One rank due to the Trustworthiness of the incoming links and others that rank because they have thousands of paid links with same keywords in the anchor text.Nobody really naturally links to a commercial sites. The links are all mostly made reciprocal or just paid links.I have seen some websites that previously ranked on the top in SERRP have dropped down by a number of places. It is said that the google algorithm is changing . See blogstorm.co.uk for more details .