It's not that simple. The money you lose doesn't just wander out of your account into the pocket of someone else. You lose (or gain) money because the price of the currency changes while you hold/short it, and while some traders lose, other traders win.
Brokerage companies are focused on ensuring that clients work as long as possible.
Yes, they always make profit, but for this money they provide access to the market, quality work of the terminal, functioning and development of various services, etc.