1. Is it useful? While not everything in our homes must be strictly utilitarian, it is much easier to justify a purchase if the object of your desire also serves a purpose beyond looking cool.1a. OK, so it's useful — but do you need it? This is the part where it can be tempting to tell yourself a little white lie. Sure, those golden bananas are useful — they can hold fruit! But if you already have a dozen fruit bowls at home, is a golden banana bowl really going to be useful to you?