GREED

 There was a scorpion, who wanted to cross a river, but cannot as he could not swim.
He asked a frog to carry him across a river.
The frog was afraid of being stung, but the scorpion reassures him that if it stung, the frog would sink and the scorpion would drown as well.
The logic appeals to the Frog, So he then agrees; nevertheless, in mid-river, the scorpion stings him, dooming them both.
When asked why, the scorpion explains, “I’m a scorpion; it’s my nature.”

To let profits run, need to keep Greed at bay, else it will Sting in each and every trade.