Some people (with little vision or desire to entertain) would be forgiven for wondering why anyone would want to buy a chocolate fountain? It all depends. If you are the type of person who invites people around then rations the food and drink and expects your guests to like it or lump it, then perhaps its not for you. (Ive certainly been to those kind of parties, where the hosts were so mean you were searching for takeout on the way home!)
However if you are a generous host or hostess who wants to really send your guests away happy, then the thought that you might buy a chocolate fountain wont seem so strange to you. Sure, the sort of person who wants to show off would also want to buy a chocolate fountain for their next party, but theres nothing wrong with trying to make an impression on your guests.
Entertaining is just that its your turn to make sure that your guests are amused, fed and watered to the very best of your ability. You might want to buy a chocolate fountain if you are planning a grand party like a wedding reception, or a retirement party or special birthday. Conversely you might want a fountain just to make a small, intimate party have that wow...