Currencies (and other assets) benefit from liquidity: someone willing to buy it when you want to sell and to sell when you want to buy. It can be difficult to

Currencies (and other assets) benefit from liquidity: someone willing to buy it when you want to sell and to sell when you want to buy. It can be difficult to distinguish beneficial market-making activity (which still involves turning a profit) from harmful speculation, regardless of the way it's described by the person doing it.