So you can trade on very short time frames, which would be difficult, if not impossible with real options or other financial instruments.
You can find a discussion of this problem in the Scalping article. The transaction costs of a non-binary, conventional broker would require a much higher win rate, as in the following graph from the Scalping article. With all the side benefits of low time frames, such as more data for backtests, and shorter drawdown periods in live trading.
But be aware that prices on small time frames are strongly feed dependent.