Scouter is given away freely. I started working on Scouter because the Mac needed this. I never thought I would take it as far as I did. I kept expecting someone else to do it first, but no one ever did. After showing some early versions to a few friends, they talked me into turning it into something for the public.
People try it and become addicted pretty easily.
It wasn't educational, I'd like to get something back for it, but I don't intend to charge end-users for it. Even if I never get a dime from Scouter, in the process of developing it, I've built tons of code that I can use in other projects. My first computer was a Mac. Not the first computer I used, but the first computer that I actually owned. It was a broken Mac Plus that someone gave to me to fix, and when I fixed it they felt sorry for me and let me have it.