It's not about forger's profit. It's about secure system. In Nxt u need coins to generate block, more coins = more chances. It makes front-attack expensive: attacker'll need biggest part of coins to write buggy chain that still'd be most diff. one (all honest chains'll be forks in this case).
If u replace PoS with PoN in start, low amount of nodes'll make network extremly vulnerable. I'm not sure even with later replacement, cos node-based attack always'll be cheaper than $/bruteforce-based attack (buy coins to generate buggy chain or crack Curve to do the same or to kill project). Should we sacriface attack cost gap for "fairness" (equal node-based forging)? I'm almost sure, that correct answer is "NO".
Well said.
Too many people throwing out random ideas to keep it "fair" but don't readily understand how things are exploited. If you want the coin to be viable, the ***#1**** goal is security. You start putting in PON and good luck with maintaining security. I myself need to read more about NXTs, but at least it doesn't jump out at me as a 'bad idea' like PON does.