Imagine if tycho decided he wants to start a new block chain and uses deepbit's huge hashrate to do that. Or if a hacker hacked into deepbit. All he has to do is temporarily disable withdrawal for a day and have all the miners work on mining deepcoin starting at difficulty 1. Before anyone realizes the deception, thousands of blocks would have been mined and probably close to a million deepcoins. Then when the miners see that they have generated thousands of DPC each versus not even 1 BTC, some might decide to stick around and see what happens. Some othe pools or miners might then join this so that they too can be early adopters of this new coin.

What do people think? Is this a plausible scenario? Tycho likely would not risk his deepbit earnings to do this? But a hacker could. That's why I think it's a bad idea to have one pool control so much of the total network hashrate.