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You get 50% instantly but you have to pay a 5% fee and wait 3.5 days for the other half. That is too slow for serious day trading.

Correct this operation is not intended for day trading. The purpose is to obtain HBD to sell because you think that HBD will ultimately return to $1. If you are day trading, you don't really care about that, you might even buy HBD at $1.30 because you think it may tick up to $1.35 within the next hour or two. So these are two completely different goals and methods of trading.

Great answer!!