Two main investors on steemit: Content creator and Curators.

If you're a content creator you don't expose yourself on to risk when trading time, attention and energy in steemit irregardless if you're powering down or powering up. But if you're a Curator and you invest time, attention and energy including lots of money, you expose yourself in a certain level of risk. As a Curator-Investor, powering down or powering up will create a big impact on Steem's value in the market.