Thanks for your extensive comment.

I for one can not tell whether the top posters of today add value to the Steem Blockchain or not. If they make more people come to Steemit because of their posts, they absolutely have value for the STEEM blockchain. But if they don't add value they are basically mining tons of steem with 'CPU' blogging. Something like that could never happen with bitcoin mining, but only with human emotions involved.

But I don't worry about these things. I'm trying to better myself as a blogger and also have invested in STEEM because I believe in it a lot. This is something I can do for myself and the Steem blockchain today and I'm putting a lot of my time into it (and loving it in the process).

If steem proves to be successful in 5 years it will have (most likely) attracted bigger names. Bigger names will scoop up more rewards because they add value to the Steem blockchain with their following (more users). In case this happens I will have a tough time competing with them with my life blogs. But I'll still be happy because I own Steem tokens.

You are right that it will be infinitely harder to earn STEEM when the platform grows. One should think about that when the sell their STEEM today.