Only consider the case of spot/double K.

Going long is relatively mindless. You will lose up to twice your principal, but you can double your principal and have unlimited profit potential.
Short selling is very anti-human. If you don't roll the position, you can make up to double the position (return to zero), and the principal may be lost infinitely (when the margin is replenished). If you want to make a hundred times the position, you must roll the position.
Summary: It’s still easy to do, never short your career.
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