I upvoted, and you're not the first to suggest this either. But I must argue that to have 3 or 4 well-ranked apps with a solid income is easier said than done, especially for a single developer.

I wish I had the insight to know exactly what 3 or 4 other apps to write so I can have a steady income. But chances are by the time I finish writing 3 good apps a year from now, I'll be lucky if one of them has as much traction as this one.

The other choice would be to take this app that already has traction (from only my part time work) and pour more time an energy into it to see how big it could really get.

Thoughts?