Rofl. I find it funny and true that the Chaos list is points intensive.
But, the options that have found their way into my competitive lists are either cheap or undercosted.
Daemon Prince with wings...nothing in the Chaos HQ slots gets as good as the cost:utility ratio, and cheap as chips. While plague marines and oblits are...undercosted for what they do.
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It's not just Lucius dying to fists and such.
It's that he has 2 contradictory special rules, I find that utterly stupid.
He reduces dmg to himself, which is reducing the usage of his "stop hitting yourself" armor. Also, cross Codex, his combat prowess was taken by Kharn, he lost a point of str, and now loses an Attack as well.
Anyway, they are fun choices, but there's a reason why they don't make it into more competitive lists in the meta-gaming level.
My 7 Cents.