actually trading is more like ponzi in nature, because always when trading if you lose some one else wins and if you profit as well some one
Else is losing money, but gambling is just for the house to win and 97% of players to lose then 3% win with the house as well.
I do not think that trading and gambling should be considered the same because with gambling you do not know that outcome and what is going to happen.
With trading you can already know for a certain extend what you can get if you trade/