So let me give you a hint. I am/was the guy who made AjaxWhois back in the days (a similar site, one of the first). It was hugely popular and I was making thou

So let me give you a hint. I am/was the guy who made AjaxWhois back in the days (a similar site, one of the first). It was hugely popular and I was making thousands a month (totally passive) with it until it got acquired and went to shit. I tested a bunch of things, ads in the sidebar, different registrars, etc, but the only thing that ever worked was GoDaddy, right in the search results. Ads in the sidebars are a waste of your time so don't even bother. I know how technical people feel about GD (I feel the same) but the truth is, their crazy upselling techniques work and you get paid commission on those, not so much on the domain name itself. I was often making north of $100 per customer I referred to them. Not sure if they still pay the same but needless to say, that was pretty awesome I also had coupon codes that gave my users a discount AND made me a lot of money. If you can get that, it's the holy grail. It just made no sense for my users not to click on the ad. Good luck!