When you start making websites over and over you always seem to make the new website with lessons taken from the other websites you have built before. It makes total sense but sometimes you have to consider the niche of the new website before applying all the things you think need to be on your new site.
For example you may make sites that have a pop up to capture email addresses. That is fine I have used them and although I hate them as a user in some niches they work great. My latest site it wasn't working as planned so I sat back and wondered why. I emptied my cookies and loaded my site as if I was a first time visitor. When the pop up came up after 30 seconds I found it really annoying since I was in the middle of reading an article when it popped. I then went on my phone and did the same thing and when the pop up loaded it blocked out my whole screen and I couldn't even exit out of it. Total fail on my end.
Also on my latest site I had an Adsense ad after the post. I have this practically on all my sits as it seems to work great because after the user reads the page they need to do something and having four blue links to click on seems to be a good thing. On this site the Adsense wasn't getting many clicks at all per 10,000 views. I think it got 2 clicks and made me 10 cents, not exactly going as planned. I knew I needed something in that spot and I knew I needed it quickly as I am sure Google looks at your overall conversion. They say they don't but I would bet they do.
I decided that since the site was new I needed to build out the newsletter list. I logged into Aweber and created a 300 x 250 looking newsletter sign up box and placed it after my post. First day I got 15 subscribers within the first hour. Since then I have been getting a new subscriber almost every hour. For a new site this is pretty good. I will probably change a few of my other non performing sites to this method. If I didn't think outside the box this never would of happened. Of course I still have to figure out out to monetize the site better.
Right now the site is using Amazon for its only affiliate program links and since there is no Adsense on the site the users are visiting Amazon more. My conversion rate went up by 1% since the switch. I wasn't really thinking that Amazon sales would be benefited from removing the Adsense but it has.
When you are making new sites try not to rely on what is working on your other sites. It may not be what is best for your site, or your users in the long run.