Happy to have set off an extensive thinking process. I'll gladly try to answer those questions as good as I can.
who should say that? It is up to the community to enforce behaviour they want to see. If the majority doesn't care it will effectively be allowed. So we first have to work on creating the consciousness that it's bad for the growth of the platform.
yes, it goes back to the pool and is distributed between all other posts. The greatest content only comes up when all the miserable stuff is pushed down.
that's very subjective. Something that draws eyes from the outside, makes people feel like they want to come back and see more of that, and makes good creators feel like this is a platform for the likes of them.
I wrote a quite long post on the topic today, it you're interested in more food for your thoughts.
RE: Do we forget about those who buy STEEM in the market? we want to kill small and large investors with the flag war spreading like a wind on Steemit now.