thanks for your respectful comments and question.  
From my perspective it seems to be that I am doing just as you suggest. By limiting ROI to delegators I am able to take SOme of the rewards and pay them forward to other minnows, as well as support external projects that can be quite impactful in the world... 

By giving some of these rewards to others who have no ability to grow since they don't have SBD or support.. I am able to help them grow their accounts and be in a position to upvote other people  and spread the wealth a little bit more.. 

The way I see it that this  is therefore putting more people in a position to help as otherwise they would not receive the upvotes and support that I am able to give them.. I am helping dozens if not 100s of minnows get more SP!

You can see in yesterdays post I was able to give significant upvotes to 41 minnows last week, and as a result they are empowered..  You can see that post here:

https://steemit.com/ecotrain/@eco-alex/pay-it-forward-minnow-support-project-week-3-41-minnows-supported

I am not anti capitalistic.. but I believe that 100% ROI is more than necessary and causes a lot more inequality on Steemit.. especially since many delegators who will receive those rewards may well not spread it out.. and indeed even remove those rewards from steemit.

Bare in mind that anyone investing their money in the normal fashion would be more than happy to receive 15-20% returns per year.. so even with a less ROI on delegation i feel that it is still an incredible return that will also give Steemit a much better reputation amongst none investors.. 

I hope I understood you right and that makes some sense!
very best to you @nofiat!