This is an unpopular opinion but there is little disadvantage for most people to be powering down at all times. That does NOT necessarily mean you should be "selling out" and collecting your Bitcoin - just taking advantage of market discrepancies inside the STEEM ecosystem. Read below and see my other posts for more details.
This is the reply I made to 
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Charlie, this comment will probably get lost in the crowd, but you may be interested in this:
https://steemit.com/money/@trending/august-2-2016-steem-market-trading-opportunities-purchase-steem-smd-at-an-18-discount-through-the-internal-market
I also have a few other related articles explaining why I'm always powering down. **My overall SP continues to increase even as I power down, with little to no activity from me these last couple weeks.** (Been busy!)
You can have your cake and eat it too. And when you plow your STEEM back into SMD available at below market rates, you're really buying money (STEEM) at a discount...all while keeping the money in the system.
Most importantly, even while the market price for STEEM has collapsed the last 3-4 weeks, I was able to make a profit by trading the markets and holding/converting my SMDs. I earned all of my original bitcoin investment back and now have a small nestegg of STEEM power that I intend to cultivate.
TLDR; I'm always powering down because it creates opportunities for lucrative trades and to purchase SMDs with a margin of safety. If you don't see an opportunity that week, you can reinvest back into SP with little to no penalty.