If you knew in advance that it was going to crash, there's better ways to profit more directly. If you didn't, seems unlikely you'd be ready to capitalize.
Besides, not sure how it works in Turkey, but most places at least: retailers can cancel orders for little to no reason, if you bought a bunch of crap right before such an event, I bet they'd cancel it.
Apple apparently canceled some orders, the social media was full of people complaining about it however the laws don't allow you to cancel orders just like that(when you order something the company and the customers are obligated to sign purchasing agreements that provides ether party with rights and obligations) and many people were quite motivated to sue Apple. Some contacted Apple and the official response was that the cancellations are due to unrelated reasons.
Turkish consumer protection laws are not bad, there are arbitration tribunals and consumer courts that quickly and cheaply resolve that kind of disputes. People use these all the time.
My brother snapped an iPad Air for the equivalent of 450$ and is expecting the delivery anytime now.
Besides, not sure how it works in Turkey, but most places at least: retailers can cancel orders for little to no reason, if you bought a bunch of crap right before such an event, I bet they'd cancel it.