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.

If your current curation strategy is very effective, others will copy thus reducing the percentage reward.

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:

Which token out there can offer you so much for so little?