Thanks for the great post! You made some really good points about why Steem is one of the best investments you can make.
One thing you are missing about delegation is the one week cooling off period after your delegation through minnowbooster is done. This brings down your annual earnings since you won't be earning during that extra week. However delegating Steem Power is still an excellent investment. I used some very rough math to calculate a possible annual earning percentage of 26.5%, which is still amazingly high.
I purchased extra Steem for this reason. I have not delegated any Steem Power yet because I have been enjoying using the platform myself. But I believe this excellent earning potential will lead the price of Steem to rise. Many will purchase and HODL their Steem because it can earn so well. I'd expect that sellers will be few because who would want to sell something that earns them such a good return. Once Steemit attracts more users and the demand for Steem increases, I expect the price of Steem to rise.
As a complete side note, another good POS coin is Nav coin. Nav coin earns 5% a year by staking, but 1% goes to the Nav community fund so you only end up getting 4%.
Of course you could add the returns of Nav, Dash, Neo and Pivix together and it still wouldn't match the amazing earning potential of Steem! Plus using your Steem Power is more fun than HODLing any other coin!