Nice write-up.
When did you guys actually started working on this and how did you transition from a day-to-day consultancy mode (no doubt bringing in a multitude of that $5000 revenue) into working on this full-time. Your blog posts don't seem to contain a creation date :)
Did you fund the initial development with your own savings or did you get angel investors on board early on ?
I can imagine that after taxes and deducting costs there is little or no profit left but it's a great psychological barrier to cross !
I wish you guys the best of luck ! Great idea and great to see people using it (and paying for it)