Drk masternodes are like a proof of stake system build on top, that is getting clearer to me every day(See instantTx whitepaper). Proof of work is a dead end.
Yep this is exactly what I realized a while back too.
The thing about it though, is they don't rely on it for network stability. PoS coins have some very fundamental issues - and this is why I suspect masternodes really aren't branded or discussed in that context. The issues with PoS coins have nothing to do with the similarity darkcoin shares to them.
So as far as securing a network goes, PoW is far from dead.