RE: To Power Up or not to Power Up, that is the question
I think we should be looking at far more than just the rewards pool. The rewards pool is just a mechanism for distributing inflation. We need to bring in money from outside the ecosystem. I wrote about profit sharing of revenue brought in by DApps in my post, Ideas for profit sharing with Steem DApps. This would involve rewarding delegation beyond just what can be obtained from the rewards pool.
Curation rewards can vary significantly depending what you upvote and when you upvote. Curation rewards also varies greatly depending on how much SP you have. The more SP a user has the more difficult it becomes to get a very high return. Someone with a few hundred SP may only need to vote 10 times a day and could earn as much as self voting. If someone has a few hundred thousand Steem, 10 votes a day will return at best roughly slightly higher than the 50% curation rewards, I would guess lower as people would frontrun them. Below is from steemdb.com.
The percentage of the rewards pool allocated to curation is only slightly higher than twice that of interest.
Another point to consider. If your current curation strategy is very effective, others will copy thus reducing the percentage reward.
All the points you mention are still great and good reasons to invest in Steem and Power Up.

I will not pretend to have the curation figured out, which is why i trail someone else for a part of my VP but i would assume that someone with 100k+ SP would have to distribute his votes at lower percentages to a larger number of people to get higher gains.
The second most effective curator on the list i posted in my post has around 50k SP and is slightly less effective then the person im trailing.
That is true which is why adjustment is necessary. I probably shouldnt have shared my trail but the point is that indeed, the returns can be much higher.
I do not know of any blockchain that offers so much opportunity for a investors as well as a creator, developer, gamer... etc.
And all that being placed at 80 in MC. Do a comparative analysis of all similar cryptocurrencies and you come to a conclusion that STEEM is extremely undervalued.
Others rely on "halving" or on "hype" but i always ask myself:
You seem more optimist here than this post - https://steempeak.com/steem/@lordbutterfly/the-ultimate-guide-for-making-money-on-the-steem-blockchain
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Oldsteem and was pointing out bs happening on the chain in a cynical way.
I still do that.
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