Online pocker will always be a question of lucky, if i get the cards to win you can do whatever you wanna that i will win anyway, considering you are exposing your money into gambling on both ways, both has a risk, the lower is the trading, since you can be loosing 70% of the coin value and you can sell your coins, while gambling if you loose its full ammount, the only difference.
I think you can set your bet amount in gambling, same way when you set your buy support for a coin. I think they have almost the same kind of risk because of the almost the same kind of how you can manage to minimize your loses. Remember it is a skilled based game, not a luck/chance game. Even if you have a very good card in hand, you can still be played by a professional poker player into thinking that he has the same or better card as you. Thanks to art of bluffing lol. Same way in trading where you read charts, datas and checking buy and sell walls, researching the item economy and all. You are still predicting something that hasnt happened yet. So you might be wrong or right who knows.