Gold

[vlngrrl]

No: HPFGUIDX 135557

Hello!  This may seem like a really elementary question, but...

"Bill...passed a full money bag across the table to Harry...'I got it 
out of your vault for you, Harry, because it's taking about five hours 
for the public to get to their gold at the moment...this way's 
easier." (HPB, p. 108 US edition).  

However, in one of the earlier books (forgive me, I don't have them in 
front of me) Sirius buys Harry a gift (Firebolt, I think) by debiting 
his Gringotts account.  

Why, if it's so difficult to withdraw gold from Gringotts in HBP, does 
Bill not suggest this way of payment for school supplies?  That seems 
the easiest to me.  

- Sarah