Profligacy
Part of speech: noun
Definition: careless wastefulness shameless and immoral behaviour
Extravagance
Part of speech: noun
Definition: excessive or superfluous expenditure of moneyprodigality as in extravagance of anger, love, expression, imagination, or demands.
Example sentence: Collecting has been my great extravagance. It's a way of being. I collect for the same reason that I eat too much-I'm one of nature's shoppers.