Battlegrounds in World of Warcraft were kind of awesome back before they (quite correctly, I guess) put all sorts of restrictions on what kinds of things could be scripted. I used to *own* the level-19 battlegrounds with a warlock and an addon I wrote to keep track of enemy targets and optimally distribute my various curses and afflictions. I just ran around mashing the spacebar like crazy, because among the few restrictions was that every action had to be tied to a hardware event.
I also earned 10,000 gold in the auction house with another addon of mine that helped me find and relist underpriced stuff. At that time, 10K gold was an eye-wateringly large sum. It's probably pocket change now...I've been out five years.
Man, I really did feel like a wizard with arcane and hidden knowledge. It was great. I've often wished for a game where programming was the way you do magic, but only that once have I gotten it. I guess a key part of the experience was that hardly anyone else could do it, or knew how I was doing it, which is how magic is often imagined to be.