Humans play something like 1 million hours a week at lvl 60 and people running bot's want them to also have good items to farm faster so it's not clear that bot's harm the economy as they would buy and sell just like a person who plays a lot. Assuming bots gather both cash and items the only possible issue is they are a larger drain on blizzards servers, but I have a hard time believing it's that significant as the player base has already been cut in half.
The end game is not all that fun so it's been losing 10% of it's population a week. Granted, there is no subscription costs so you can come back at any time.
