in PoW = The Bitmains and spondoolies
edit: I meant the Ghash.ios and Disqus Fishes
What's the difference?
Ah yes, largest mining pools control even a bigger share than largest stakeholders.
The difference is that dominating pools/miners change all the time. Right now it's Discuss Fish, not too long ago it was GHash, before that BTC Guid, Eligius, Slush etc.
They had significant % share in hashrate but lost it to others.
If you have PoS holder controlling significant % of all coins - there's nothing you or anyone can do about it. Unless he willingly give up some of his stake, he will remain with his % and will be slowly increasing his market share.
It does not matter if Disqus Fish or Ghash.io has >20% of the hashpower.
And almost all stakeholders changed (at least the coins are now in different addresses) in my PoS coin.
The hardest fact for me is just:
https://blockchain.info/pools
vs.
https://nxtblocks.info/#section/blockexplorer_charts (click on "blocks")
Despite all "rich getting richer", there are more parties (or accounts) involved in block generating of my PoS coin.