Greed under what context? We should all be greedy and compete for Steem Power. If we all do this then Steem will be a success. But I do agree, in terms of Steem Dollars, of course there is a cost of living for every blogger and you could make a case that if a blogger is getting $20,000 on every post that maybe after several payouts like this that they can ease up so someone else can get paid.
But this assumes the whole point of Steemit is just another job which people do for pay. It takes the fun out of competing for Steem Power, with the dream of becoming a dolphin and eventually a whale. Some of us set goals to for example reach 100,000 Steem Power and care more about that than the size of their payout on a single blog post. In fact, having a huge blog post while it does attract attention it can also make others envious. Yet if the real goal is Steem Power then when the price of Steem goes down the payouts go down but we can acquire more Steem Power from the payouts.
I think large payouts can be good, but I think its most important to keep Steemit fun for most people. New features can do that but I think the purpose of Steem Dollars is mainly to support the cost of living of bloggers so they can afford to keep playing, but the real reward is Steem Power which allows the players to feel good paying minnows and being a whale.