Why is selling option strategies have higher probability of succes than buying options? As an option seller you're basically trying to create a boundry for price movements. When price moves directionally, that's equivalent to consecutive hits on a dice. So you try to create a boundry where that doesn't happen MOST OF THE TIME.
Now remember the example I gave about consecutive occurence given a % rate? when you sell option you're betting that prices would not get directional moves consecutive times.
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This is why trading is so hard. Even if you believe in random entry, prices can go against you like 10x your range 11% of the time (if you use 1:1 RR). I mean 90% probabilty in your favor is still damn good.
So if you trade 1 position, it's impossible to be profitable. If you scale in, you're limited by your account and exchange limits, but sure is alot more probable to win.
BUT!..I didn't say you can't make money trading. At least from the retail side, there are few ways to increase your chances to profit:
1. scalp noise - you're basically in and out (can be both momentum and mean reverting)-
2. scale in - you're betting you can set your entries to be beyond the typical statistical anomalies.
3. using breakeven stops
4. trading high volume periods -see point 1.