About 9 months ago i created https://namesmith.io , a business and domain name generator. I practically did nothing to boost the search engine ranking but the volume of visitors is growing (very slowly).

So far the site can barely cover my vserver cost but that's ok since I can use the server for more than just namesmith. Most of the time some few dollar amounts tickle in but I had some sales of premium domains which gave > 50$ each.

I still plan to add some more features, such as URL shortening, but at the time it is not worth it.