@kingscrown Bitcoin is probably among the most dangerous assets to short sell given it's high volatility and it's tendency to multiply itself rather quickly in a bull run. Chasing the potential for limited profit, an inexperienced trader could end up losing several times the amount he stood to gain by shorting because the loss on the upside is unlimited.
For less experienced traders, it's always better to not leverage themselves using short selling because they would simply not know when to sqare off unlike experienced traders
For the experienced, it's a good way to earn quick buck though.