numismaddict 

A person who is addicted to acquiring wonderful, beautiful, expensive, precious metal coins. A numismaddict is someone who is diagnosed as not being in control of their impulses or need to buy coins, even to the point of going broke to obtain them.

Numismaddicts sometimes "coin" new words to describe their fanatical passion for coins.

His numismaddict behavior eventually drove him to the poor house. Fortunately, Numismaddicts Anonymous was there to help him share his obsession with other numismaddicts. Professional treatment is also available.

numismaddict by Coin Monger February 21, 2013