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so what is the point of the stabilizer if it won't keep HBD at 1 dollar?

To create selling pressure on HBD toward $1, create buying pressure on HIVE, and generate a profit for the DHF and Hive stakeholders. That may ultimately end up pegging HBD at $1, at least more often than previously, if not all the time, but either way it is pushing in that direction and accomplishing the other benefits.