Well, am not at all worried by the bots or really worthless content earning so much. Steemit is by design a system that evolves and gets better promoting quality content and contribution to the community. It's still in the very begining stages and it will take time to weed out the bots and spammers. They may get huge rewards now but at some point get worthless. So do what you keep doing - that is writing and posting quality stuff, voting for what is worthy, and importantly flagging what is not!