this post in no way supports those who go out and attach outside software to exploit this game
Well actually this post isn't, but you are by buying their ore
Not everyone has deep pockets in this stage of the game, some people even struggle to get 30G (OK, they should read "making gold for dummies", but still)
Bots kill the effort of honest (but poor) players trying to make gold by farming ore, herbs or leather.
They also turn the gold-making game into a brainless "buy it on AH and sell it to the vendor" type of thing.
A guild filled with bots could probably be programmed to do instances and farm BOE epics, it's great if you got the cash for 1000G BIS epics,
but it's killjoy when your guildraid gets one of those and then sees it's worth a lousy 100G per person, where in a bot-free environment that would be 3000G each.