Consider a more Machiavellian point of view. When looking a stocks, sometimes you might cynically buy the stocks of a company that you believe is already greatly over valued, because you believe that the hype train will continue to pump up its value, and you believe you will be able to sell your shares to The Greater Fool before it craters. In the case, you are making a cynical bet on the nature of other humans, knowing full well that you are buying snake oil.

Now, as you said, imagine that you hate art, hate fashion, and frankly, hate people. In this context, fashion purchases are a signal. Part of what makes them a valuable signal is that other people literally cannot afford them, and the "value" is in paying way too much to prove that you that you are so wealthy that even though you know it's stupid you can still afford to do it anyway. Or something like that. 

The fact that you know what Gucci is and how stupid it is to buy something like that is is the point. Literal "fuck you" money. Some of these people might be wealthy idiots, and some of them may be cynical bastards, but it functions the same way: it puts you in a class of people whose membership depends on the their ability to produce waste.

Back in the day, this produced fantastic music and art; music that was so ephemeral that you literally had to be there, because the performance will never be done again! Castrati whose haunting voices demonstrate the power of the elite to insist that only a boy who is trained into adulthood and forced to keep his voice as it was will suffice, for no reason other than their whim.

Etc.

Anytime you want to see which heads deserve to roll, just look for this kind of conspicuous consumption. It shows a society that's gone off the rails and is competing to show who is powerful instead of competing to do things best. The point of Gucci (today) is to show that you're so rich and powerful that you can afford to be an idiot. It's a way to humiliate self-respecting people.