This blockchain has been exploited since the start. There used to be some way to 'mine' it and someone managed to make a lot from that by exploiting some aspect. I can't remember the details. We have had people looking for those who try to cheat the system. That can be subjective and often leads to debates, but it needs doing. I have a fairly big stake and I take that responsibility seriously. Most of my voting is manual as I do not trust trails and curation accounts to just support the good stuff. I tend not to give big votes to posts that already have top rewards.
If Hive ever does grow to millions of users then rewards will be spread a lot thinner. You would hope the price will go up too, but in time it could be much harder to earn as much as some do now.
I also think sniffing out cheaters is and important activity that ALL stakeholders need to do. It's in our best interest to look after the integrity of the chain and to protect the value of our stake.
Eventually, there will be no free lunch for cheaters and milkers though and everybody will have to work to earn some HIVE.