I have never used impressions and also never been questioned from any affiliate network or program that I use, I actually know more people that don't use impressions compared to those that do. There are plenty of valid reasons for hosting your own images, faster page load time etcWell, I hope others find it useful because to me, and I am a rookie really when it comes to CPA, I now have 305 impressions and I did not need 10 tabs open hitting refresh, visitors to the page did it for me. So, 10 clicks and 305 impressions since noon, I think it keeps me under the radar as it shows I have traffic, which I think is also important, it looks better than 0 impressions and 10 clicks, but as I said, I am a rookie really.