There are long term trading ranges. Look at the prices a few months back and it's inverted. There are even stretches with SBD being under a dollar. While it isn't a guarantee the price of SBD can't flash crash, the price of steem is based on a 30 day average. As long as you are reasonably confident that SBD is going to be worth more than $1 and less than the cost of steem then 50/50 is the best option and has been that for weeks.