I created Meteor Toys, available at http://meteor.toys

It's been very good to me, but also trending down as people seem to be diversifying from Meteor. Certainly not what I expected when I got into it.

The story for it is a simple one: I solved some of the annoyances during development for myself with by making a devtool, and then open sourced it.

The reaction was very positive and encouraging. Between the opportunity to make more tools, and the downside of having to maintain them, I decided to create paid tier for the tools.