Lately, I've been looking for new places to advertise one of my websites, and I thought to give a try on buying banner ads. I myself am blind to ads and banners, so I didn't have high hopes about them, but I thought I'd give it a try, since my product is about SEO, and I had the opportunity to buy ad spaces on 3 forums about SEO and online marketing. On May 6 I launched ads (banners 728x90) on all 3 websites. I spent $170,10 on 3 ads. They'll be shown for a month, 10K impressions each. That's 30K impressions TOTAL. They've been Live 10 days now, and the results are... TERRIBLE! From 7,5K impressions, I received only 17 clicks!!! Which is only 0,23% CTR. The results from each website vary. The best CTR is 0,36% and the worst is 0,10% (which is, by the way, the most expensive site). This has been one of the worst investments I've ever made. But if I wouldn't risk it, I wouldn't ever know. Maybe my banner ad looks like shit (I don't think it does), and maybe the CTR would have been better by testing different designs, but purely on the results so far, it sucks so much. By the way, I've been testing ads on Quora, and the CTR is way higher (around 5-7%) and the cost per click is way lower. Here are stats from Quora ads: I'll update the thread once the ads stop showing, to show you the final results.