Although i agree with everything else, i somewhat disagree with this

Here you deal with real people, telling you with their votes if they liked or not your post, or if they think it will take off, hence expecting some curation rewards.

It's not always whether people like or not your post. HP plays a tiny role as well but i think one of the most important factors is manual curation. For example, many users use auto voting services, maybe because they don't have the time to curate manually or something else. To that add the fact that it's not that easy even with the tribes to search for new users and quality content.

So if we take into consideration the above, even if you write good posts, depending on which tribe you are (if you are) then nobody may actually read them. In other words, it's not like somebody doesn't like them, it's more likely that many people haven't even discovered it :P