The volatility is priced in
The premium for any option includes a consideration of the expected volatility of the underlying issue.
As time wanes this premium decays and this is the main reason you can be right about an option trade and still lose money.
When you buy a straddle you pay a double premium so you must have double the expected volatility to succeed.
While it is almost a certainty that the underlying price will move during the life of the straddle, the question is will it move enough to pay the double premium and still leave a profit.
The Options Market Makers are not in business to make you money, the are in the business to take money from traders with such naive ideas.
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