Where this could come in handy, for example, is when you are trading altcoins for bitcoin and you buy/sell back and forth. Your exchange might list the amount you bought, like 0.47832234 BTC and the amount you sold, like 0.59337129 BTC. You would highlight those two numbers and specify which one should be (+) and which should be (-) and it will give you a quick idea of how much BTC you profited in that trade. You can then get a rough idea of how much USD that total amounts to at today’s current BTC->USD exchange rate.
A suggestion:
- You might want to consider changing the highlighted (green) part to its real value/rate (some users tend to hodl for sometime, before they buy/sell and that leads to false results [I do know it was meant for giving users a rough idea and not the exact profit]).