Holy shit! This is literally my story too. Playing runescape and writing scripts for botting programs was literally how I learned to program.

I ended up becoming a moderator on the RsBot forums and I remember Autofighter Pro when it came out. Super popular, and I didn't even realize it was made by someone the same age as me back then!

Anyways, even though I didn't make any money (I gave my scripts away for free!), I did learn a lot. I'm currently an engineer at Google and I honestly owe it to the incredible monotony of playing Runescape.