tl:dr - masternodes are ingenious, BUT large investors will make profits that small investors can't, hence the inequality of darkcoin distribution will widen.
I 100% agree on the decentralization, spread your Masternodes out to more VPS/Masternode providers.
I disagree on the inequality part, even if you just own 100 DASH you can put them into one of those excellent Masternode pooling services and gain percentage wise exactly the same (..as long as the service costs don't eat your earnings).