This one’s for Bitcoin millionaires (or even just normal millionaires). Invest in a million dollars worth of Steem Power, post anything you like and then upvote your own post. You’ll bestow hundreds of dollars upon yourself each time, without depleting your investment one cent.

That's just a little silly... Part of the point of the platform is that large holders are strongly incentivised to pro-social behaviour. Upvoting your own stuff indiscriminately absolutely undermines your investment because it undermines the platform as a whole, which you've committed to long term with Steem Power.

There's a reason you don't see @ned or @dan or the other big whales just posting and upvoting their own comments. It's pretty dumb.