* I made something similar to https://keywordtool.io/ https://keywordtool.io/ which focuses on long-tail keyword research. I even signed up for Stripe and had s

* I made something similar to https://keywordtool.io/ https://keywordtool.io/ which focuses on long-tail keyword research. I even signed up for Stripe and had some account management stuff. I was the only user ever and even I didn't really use it more than 5 times. It was a fun little project, but nowadays, I wouldn't hassle with account and payment stuff until I had actual users :) * I wrote an eBook and sold maybe 3 copies per month for $9.99, for a while, but it wasn't the success I thought it would become. I made it free eventually, because I thought the SEO helped more than having it as a paid product.