Some accounts are on steemit with no real activity.
Look at this account:
It has almost $20 million but no activity at all! So it's pretty much useless to the steemit community.
Of course, I get that poloniex and bittrax serve a vital function by trading STEEM. But they could easily trade STEEM as well as curate and create content. There are also many individual trading accounts out there that are just sitting idle.
Furthermore, there are bot accounts which do the same. They perform the bot functions, but do not curate or upvote content.
I do acknowledge that bots and trading accounts are healthy for the steemit community 99% of the time. However, we need some way to encourage these accounts to use their curating and creating powers.
Just think. There trading accounts all have MILLIONS of steem power combined. That's a lot of power that's in the steem system not being used.
We need some way to either further encourage posting and curating, or discourage NOT posting and curating.
Maybe have a function like account decay, in which accounts lose their money at an exponentially increasing rate for nt being active curators. So after three days of no activity, have (for example) e - 110% of their account value go away daily. For each consecutive day without posting, the amount lost doubles. In this way, those who go on short vacations or are too busy to post only an infinitesmal amount of STEEM, while the large trading accounts will be compelled to post and curate so they don't incur penalties. If a user will not use STEEM for a long time, he can just cash out everything. I don't know how we would do this while powering down, though.
This is just a suggestion. There may be better ways to do it.