Awarn - 2:55 pm on Jul 3, 2013 (gmt 0)
Couldn't this be a result of Panda and Penguin? As sites are hit, webmasters try several different methods to regain position. One of those methods would be to start new sites. Or even if they aren't hit they use this technique as insurance in case they do get hit. As certain methods begin to work the sites are tweaked and sites controlled by certain webmasters would control the ranking real estate for certain terms. Unfortunately we do not control the web. At this stage of the game Google makes the rules and we can only react. I agree this isn't an ideal situation but we have no say in the matter.