Still I think that it is kind of weird. Sorry for my disagreement-
Think of it as all the adventuring incidentals especially the "off screen" ones.
It also makes the characters well more "human"(for the lack of a better turn).
Its the money they just up and blow on silly things. Something a lot of players that are controlling the characters are not likely to do but the characters themselves are.
If a player wants their character to be ultra careful with money it takes a game resource prudence to be that way.
Fantasy craft is thus far one of the best system when it comes to having the character fluff meet the mechanics.