Of course why would someone buy expensive Bitcoin when you can get it a discount? It just doesn't make any sense. Not just Bitcoin but other crypto currency as well.
That is right why people should spend much money for purchasing Bitcoin or Altcoins if they know the cheapest price of it. The problem is that trader or bitcoin lovers don't know when it is going to donwfall or increase. Therefore, trader or investor are waiting and holding for a bitter long time than missing the profit.