I don't think it's needed.
Also, it would confuse me, as :
Gold in : 5,000.00 would indicate I've gained 5k fg
Gold out: -5,000.00 would indicate I've gained 5k fg
Do you see where the potential confusion is? It's a double negative.
I think you have a good idea, that's just not needed/executed in the right way.
Maybe try to think of another way to organize this information that you feel would be better?