That's not true, I performed calculations beforehand to decide whether it was more profitable to hold BTC in the margin wallet as opposed to other assets (which I knew would rise after the fork). The core question is whether altcoins would rise more than the price ratio of BCH/BTC. Alts went up 20% while BCH/BTC is ~0.15, meaning you were better off skipping the BCH altogether and just holding alts. The tradeoff is the increased risk.