Rich people have $500 toys like this. Because they can.
Beautiful and stylish decoration, to display any magnum bottle of champagne on a bar or dining table, or can be used as a centerpiece.The champagne gun was designed to be used with magnum sized bottles (1.5 liters). Although most champagne bottles will fit your gun, there are a few exceptions; Specialty brands magnum (1.5 liters) bottles such as Ace of Spades, Dom Perignon, Cristal, Ruinart will not fit the Champagne Gun.
Pic via Uncrate.