Someone addicted to be willing to do anything to the extreme to buy what she/he wants. It doesn't necessarily has to be something they NEED.
Things to the Extreme:
Camp outside their favorite store to be the first one in the store.
Steal money to buy things they want
Lie, Fight for their desire item
Kill someone if is necessary
And the crazy list continued..
Because my mom was a shopaholic she got into a divorced, ended up in dept, stole and killed for money and unfortunately she ended up in jail.