How to open an opteck binary options trading accounts
A broker has not the freedom of arbitrarily reducing the payout. But why would you want to trade binary options anyway, when you also can trade serious instruments instead. Profit and trading cost of a binary option are independent of the time frame.
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.