I built Premium Ghost Theme marketplace http://www.gtheme.io/ to sell premium ghost themes. I designed most of the themes because I have chicken and egg problem. Now I get about $100-$300/m revenue.
Most people still dont know what is Ghost https://ghost.org/ yet. It is CMS that like Wordpress, but built on NodeJS.
A ghost theme market place you say? I went to the site and sure enough, it's ghost themes. Premium ghost themes in fact. I still have no idea what the fuck ghost themes are though.
My passive income, Ghost Theme marketplace http://www.gtheme.io/ Revenue around 100 USD per month. Running for half year need more marketing for better revenue. Ghost blog is the next big thing in blogging space.
Nice. Staying ahead of the curve like this is the right move. That's gonna pay off when 10x as many people are using Ghost and your site is already ranked at the top of the search results.
Similarly, if you're building a content site, the time to do it is right when the hype around your topic gets started. Think upcoming movie releases, video games, elections, etc. Build out the content around the hype, then when the time comes you're at the top and nobody's gonna knock you off. I know quite a few people banking some serious coin from this strategy alone.
Ghost (https://ghost.org/) will be the next big blogging platform and GTheme.io is the first Ghost Theme marketplace that focus on Ghost only. Ghost App marketplace is ready and waiting official Ghost App available.
Most people still dont know what is Ghost https://ghost.org/ yet. It is CMS that like Wordpress, but built on NodeJS.
EDIT: Added what is Ghost