Great explanation, looks like you really did look into the numbers a bit. So it seems then if your authoring a post and doing ok, then and gaining some SP from curation the your going to be ahead of the inflation curve as it is, and should be winning overall!
i think solely curating is possible I have been trying to up may game lately and I am am around 9% ROI. But one or 2 post a week added in, and with the upcoming comment changes, 10-20 comment posts, I think you can stay ahead.
Also I didn't mention because I didn't want to go into too much detail, but inflation is falling at 0.5% a year so going forward solely curating will be viable (maybe)
That sounds like great news.