You mentioned the main reason : greedy people . But if the system is fair , these people should not be able to manipulate the system . steem pays it's users millions of dollars evey year and by manipulation that money will not properly be distributed and it's unfair . We should be aware that people don't directly give money to each other .this is not a donation of money this a distribution of money and people are just part of this process. this is in fact the system(users are part of it) . And it 's very important that the system is fair . I suggest , for instance , that any post that wins the highest number of votes will give the more steem even if the voters dont have many steempower.yes they dont have a good steempower mabey because they are not rich but is this mean that they dont have reason? what tool should we use to find the real value of a content? With The power of money ? Or the power of reasons( real majority). (Of course mabey there is a person who is rich and smart ).