outland88 - 5:23 pm on May 9, 2013 (gmt 0)
From what I have observed the link building may lead to rankings as high as positions 8-20 in very competitive areas. Seldom rises above that. Once there is an update the rankings often vanish. I speculate that relates to the very distinct link profile. This doesn't seem to matter to the companies involved because they just turn out newer sites to achieve the same goal. In some areas what you're doing may only require 10-20 links but in the areas I track it may take hundreds of links.
It typifies the sad state of affairs Google is in.