Shorting bitUSD is definitely not a conservative strategy.
I personally will not do it because i have been burned by margin in the past, and will never use it again. At times like the present, I simply keep buying as many shares as I can as I get new money, and hold, without the need to worry about margin calls.
Nothing can ever take my BTS away from me. It could go to zero, but you are not getting my BTS unless the price goes back up to prices I am willing to sell at again.
With a potential margin call I cannot use this strategy of averaging in during periods where the price is dropping.