Comment: Why would traders keep money

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Why would traders keep money

Why would traders keep money in gold futures, in the current environment, with equities making new all time highs? Especially with the COMEX raising margin requirements on gold/silver. If I'm a trader I'm not going to want to hold gold/silver long term. It's a lost opportunity cost.

I could trade the $SPX or Corn contract for example with much less of a margin requirement.