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How can it be possible that only ~10% of options expire worthless, and only ~10% are exercised?
Consider the futures market. Traders buy and sell gold futures, but very few contracts, relatively speaking, result in delivery. The contracts are sold, and "Open interest" dwindles to near zero most months as the final date approaches. The seller buys back his short position, the buyer sells off his longs.  When I own a call, and am 'winning,' say the option that cost me $1 is now worth $2, I'd rather sell that option for even $1.95 than to buy 100 shares of a $148 stock. The punchline is that very few option buyers actually hope to own the stock in the end. Just like the futures, open interest falls as expiration approaches.