If I did misinterpret then that's my error. 80/20 rule - Pareto Principle?
A socialist - or any other form I suppose - economy that stifled innovation would collapse, it should be encouraged and appropriately rewarded. I agree with your point about human nature, at least in the sense of it being a mix of collectivist urge and selfish individuality - that's my interpretation, I'm not ascribing it to you - which has to be satisfied. I'm not sure of this but I think an advanced anarchist society would recognise this because an advanced anarchist society, theoretically I think, is about as much freedom as possible for the individual within society. Capitalism restricts freedom if freedom is seen in total. Anarchism desires maximum freedom for all citizens in total. Again, I stand to be corrected on those points.
Pareto Principle, essentially yes, (actually had to look it up, I'd never heard it called that before) but that actual percentages fluctuate to a small degree either way. One other way to put it is if we took all the money in the world, redistributed it equally within an unspecified period of time those who had most of the money to start with would end up getting it back, approximently 20%. A couple of rather wealthy friends of mine put it this way: 80% of the people are chasing 20% of the money while 20% of the people are chasing 80% of the money. It's a mind set, either employee based or entrepreneur/wealth based.
And it doesn't have to be an 80/20 split either way. In a capitalist (can we agree there's no pure model in reality of any form of economy? If so I'll just use the terms as if they were pure, understanding that it isn't the case in reality.) economy that imbalance will be obvious.
The split isn't representative of human nature itself but is decided by the nature of the society and it's economic structure. I'm searching for words and concepts here but I have to keep going.
Capitalism presupposes that there will be a very rich minority while the rest will have varying levels of wealth going down to extreme poverty.
Socialism presupposes that communal ownership of the means of production will reduce these extremes.
Capitalism seeks to maximise happiness for the few and doesn't attend to the misery of the many.
Socialism seeks to minimise misery for all.
As I said, these are perfect and abstract positions, not sustainable in reality. I'm only putting them forward for the purposes of discussion.