Same reason you buy shiny glitterballs with money you need for other things, perhaps?
Because it's her money and therefore up to her what she spends it on and she likes handbags. Perhaps you are narked because you have to buy your handbags from a charity shop and your sister doesn't?

You sound a little jealous to me.
( Wicca'd Witch needs ideas for a new sig on..., Fri 1 Oct 2010, 0:45, 1 reply)

Except...
It's not her money, it's someone else's money that Smash Monkey's sister has borrowed and, by the sounds of things, either won't repay or will borrow more money to repay.

I get the impression that SM wouldn't mind her dear sister spunking her money up the wall, IF IT WAS HER MONEY. But it isn't, so she does mind.
(Sir Itchalot has a very self-referential signature, Fri 1 Oct 2010, 9:51, closed)

^this in its entirety

( Smash Monkey lowering the tone of the whole internet, Fri 1 Oct 2010, 14:33, closed)