Keep in mind that you don't want to run your conversions of HBDs to HIVE when HBD prices are over $1. That's when you want to sell HBD for HIVE because you get a premium on the HBD. (And you hopefully bought HBD at or below $1.)
Buying HBDs under $1 and running the conversion will yield $1-worth of HIVE at the 3.5-day average price.
So, if you purchased HBD at $0.80, ran your conversion, and the HIVE price was $0.50, you'd get 2 HIVE for your 1 HBD that you bought at $0.80. If you then sold those 2 HIVE, then your profit would be $0.20, or 25%.
RE: Another way to obtain Hive through HBD. How is this? [EN/ES]