We must remember that a power down can be stopped at any time too, many users power down for a bit then stop, it can be a way to diversify your cyber currency holding and spread possible losses too. It is really not wise to hold all your investment in just 1 or even 2 cyber currencies.

I see great benefit in powering up your rewards in Steemiit, but powering down is a way to keep more liquidity, and/or it is a chance to take some out to invest in other cyber currencies without having to invest fiat money.

When you power down you are only able to get at most 1/13 of the total you hold, so there is little chance of disrupting the financial stability of Steemit.

Thank you for your post, it is very informative.
upvote & resteem