It is when a party is held at a vacation home and the building and facilities are destroyed. There is a risk that a large number of people will leave the house after a party, leaving behind a large amount of leftover food, the smell of illegal drugs, or the carpet being used as an ashtray. There is also a risk of large amounts of garbage being scattered around the room. Floors, walls, ceilings, door handles, etc. may be sticky with grease from cakes, etc.
Even if the terms of use include prohibitions against such users, unfortunately there are still users who do not abide by those terms.