As we know the Weasleys are quite poor. Not poor enough that they don't have anything to eat but still so poor that they have to buys second hand clothes and books for their children.

Still when they win 700 galleons from the lottery they burn most of them on a trip to Egypt. While it must have been fun it was extremely unwise. Afterwards they are poor again - Ron has to wear a second hand and extremely old-fashioned robe on the Jule Ball.

So why did they spend so much money on a single trip?