Nice input, I just have a quick correction, "your" Sp doesn't double every year, SP doubles every year, yours gets a 90% gain in the year, so if you don't earn 10% of the SP you earn in total from comments, posts, and curating, you'll actually lose stake in the platform through inflation.

You'll still gain SP every year but others will be gaining a slightly bigger stake while you'll be losing a little if that makes sense. You hit the nail on the head at the end with the price of steem though.