Oniomania....

Now I have a new word to address people who shop till they drop... :p

Oniomania is another word for the urge to shop till you drop, habit of the debit, thrill of the bill. According to a pearl of ancient wisdom, we don't acquire things, things acquire us. In the case of oniomaniacs, it is perhaps the fun of acquiring things that acquires them.

...and I am definitely not an "oniomaniac"... :)