According to Search Engine Land the new google update will penalise your site if you have too many adverts on a page lol and to start with I had to check it wasn't april fools day but alas it isn't
it was mentioned on the google blog
I can see their point in one way but it also seems a sure fire easy way to get rid of competition. Too many other adverts and bang your out of the serps.
What do you think?