Bots also ruin the gaming experience. You're going in to a dangerous forest to hunt a boss monster; the travelling Mabinogi Gold experience should feel suspenseful and epic.
However, when you get in there, there are at least thirty bots in starter clothing, all killing random monsters, then picking up their drops. One dies, and another fills its place until the original returns from the spawn point.
All of a sudden, it's not a scary forest but a boring factory filled with humanoid machines. The illusion of adventure, a very crucial component to an MMORPG, had been shattered. Bots may also get directly in your way.
Perhaps you had gone to the forest to hunt the exact same thing as the bots were, since this is proven to be the best and only efficient training spot for your level range.
However, all of these bots are taking all of the kills, and from their hours of farming are able to one hit them. When you finally get a kill to yourself, another botter comes and steals it, and picks up the rare drop that had come from it. I'd be pretty ticked off...
Some bots are made to advertise their gold selling website, creating useless spam when you and your friends are trying to chat.