the clearest answer to your question of how does NC benefit from all the bots is...... the bots belong to them! i think it is entirely possible a majority of them do. and why not? with bots making so much adena NC can benefit in real money for selling that adena. i also believe many of the bots that don't belong to NC do belong to their high-spending whales and are thus immune from banning. ban my bots, lose my money...
of course they aren't going to respond. they can't answer the hard questions. it's pretty obvious that, despite them saying they ban hundreds of bots, they really aren't effectively scratching the surface. the game is unplayable because of the bots, they are losing real players all the time. soon all they'll have left is bots and whales. it all comes down to bad management policies within the company. the bottom line of greed, botting makes money. bad management is in the fact they refuse to fix the problem and even worse, they refuse to communicate with their playing community.
yeah, this thread is 13 pages with no GM response. and they won't respond. the game will die because they refuse to enforce their own rules which will drive real people away. they don't get it, they don't care. they'll milk it for what they can until it's dead.