I completely agree with you, except I think it's a new supply of kids for anyone who can pay their price.
And many here will say you're overstating the case, but that is EXACTLY what they do: they steal the children of the weakest, for their children mills. I personally know several families who have been targeted by CPS.
It is also a common tactic of ex boyfriends/girlfriends/ husbands/wives. For revenge they will call CPS for anything to pull a family apart just to get revenge.