Gold ETF...Let it Ride?

Two months ago, I invested $1 Billion of my "Virtual Portfolio" into the gold ETF (GLD) at about $162 share....then the Market collapsed because of the Greek Debt, but I let it ride until today.  The "virtual Portfolio" lost $62 Million in assets...until last Friday June 1 st.  Two months to recoup the loss, but it worked.  Today I cashed out.  My imaginary portfolio is still about $40 Million down from its all time high, but since it's creation in September of 2010 has returned 58%...GLD has returned 16% YTD. 
While only "Virtual", I find those returns acceptable.