What is the optimal amount of co-op links to display on a page? Or does it even matter if you display 3 links vs displaying 20 links? Or is the weight simply based on impressions and not the number of links you display?
Weight is based on both impressions and number of links You can test it and see what is the difference
and try not to use the "nofollow" option because it decrease 1/2 the value of your website in ad-network.