Quote from darkhorse:
In quick observation, beta has value from an asymmetrical perspective, because it acts like leverage you don't have to pay for.
Think of two low-priced stocks, both $5 per share, where stock A has 2x the beta of stock B. In both cases your downside is limited to $5, but, ceterus paribus, stock A will move higher faster.
Increased size also has its drawbacks. The problem with loading up on a low-beta instrument, to adjust for its slowness, is that a tail event can come along and hit you all the harder (think of the low beta stock that is halted and subsequently gets cut in half).
With that said, I would submit the debate between gold vs gold stocks is a lot more nuanced than simple beta measures...