At $500+, I don't know why anyone in their sane mind would hold Bitcoin. You aren't going to make +100% gain from $500 in 2016.
If I buy gold, it has less utility than Bitcoin. Where can I spend gold? Nowhere. All I can do with gold is mail it back to the gold dealer for 90% or less of what I paid for it. 
I don't know where you are from but here in Europe, the local shops give you 97% of what you've paid.