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Are you really believe that you will get $50 per bitcoin until your payment time is up? And now the price of bitcoin is just around $224-$225 so I dont think the price will hit until $274-$275 so it is pointless to do that kind of trick
There is nothing wrong with that, he is simply stating up example so he can indeed put up any number into it but he forgot the vital point that a skilled trader wont even wait for a 10 % increase to sell it, it will be around 0.5-1 % to execute the sell for them
unless you can systematically, be good with selling at such low % in the long run, fees would be a problem, those are anyway good shorters traders, a more bullish will wait a bit more before selling to squeeze the maximum amount possible, and the risk will rise too, of course