The point there was to avoid the “I can’t let you do that, Harry” by making it obvious to Dumbledore (who knows Harry’s current wealth) that Harry has a trick up his sleeve. Mentioning the arbitrage trick in public would be a terrible decision, which is why Harry just thinks that.
The point there was to avoid the “I can’t let you do that, Harry” by making it obvious to Dumbledore (who knows Harry’s current wealth) that Harry has a trick up his sleeve. Mentioning the arbitrage trick in public would be a terrible decision, which is why Harry just thinks that.