I once made a "killsteal" cheat program. Never used it beyond testing it and making sure it worked, but as a concept, it wasn't that hard. Monitor people's health and inv status, wait for 1 or 2 health, no inv, then warp to their position and shoot a golden seeker.

The reason we don't cheat is because it takes all the fun out of it. Imagine I used my program! I get the highest score, but at what cost? Everyone hates me, no one wants to play with me, word gets around that I'm a cheating cheater that cheats, I have no fun, and anyone on any server I play on has no fun.

Uh, I was going somewhere with this, but now my fingers are cold.