The scourge of hyperinflation

A temporary water park has quite literally popped up in the harbour. 
At EUR22/adult and EUR18/child for a 1-hour session (45 minutes on the water, and 15 minutes applying the vaseline, getting your credit card, and obtaining your signature on a document exonerating them of anything from drowning to invading a small neutral nation), it looks like it is not just their water park that's inflated...  
A nice even EUR100 for a family of five (they don't do family tickets). For 45 shaggin minutes. 
Perhaps it's made of inflatable gold?