This is always an interesting topic. One thing you're missing that is big for steemians though: steem power delegating!
You can delegate your steem power via the Minnowbooster market, earning daily steem payouts for your delegation (which never actually leaves your wallet!).
This is steemit's secret weapon and I've done a few articles highlighting how I'm using my passive steem (spreading it into other projects mainly) and why it's good for people to lease (short term use of powerful upvotes for marketing).
RE: Passive income from cryptocurrency: Holding, staking, airdrops, and hard forks