Silver Price Collapsing - ProShares UltraShort Silver

Price of silver has plunged for 4 straight days and is down more than 27% since the high on Friday.  So one way to play the plunge in silver price is to invest in ETF named ProShares UltraShort Silver(NYSE:ZSL) which seeks daily investment results that correspond to twice (200%) the opposite of the daily performance of silver.  And since Friday the ETF has gained more than $10 or 70% from $13.63 per share to today's close of $24.34 per share.  The increase in volume shows lots of interest on this ETF.