Maybe you have one little whim. You want something that you don't really need, but it doesn't change the fact that you wish to have it. Your dream has a short name. It's called a hot tub. A man yearns for something that does not necessarily need life, but he still desires to have it. That's why people take tennis courts or an indoor pool on their gardens. That's why people take their own ships, caravans or even pieces of forest if they love hunting, for example.
When other people also benefit from your dream
It may be vanity, but don't you have the right to make a happy time? And have other people not benefit from such apparent vanity, who can use these joys together with you?