What is the reason why people can't finish using perfume even after buying it?

When I buy a perfume, I use it with great satisfaction at first.
However, as time goes by, you won't find yourself reaching for it as often.
It’s definitely not that I’ve come to dislike the scent, but strangely, I’m more drawn to other scents.
So, in the end, there were many cases where I used it a few times and then left it unused.
I was more concerned because I heard that perfume has an expiration date.
I also empathized with the point that not many people use it all the way to the end.
I am also wondering if buying a product with a large capacity is the right choice.
I'm also confused about whether it's better to share several items or use just one consistently.
I also became curious if perfume is a product where tastes change quickly.
So these days, I have become cautious even when buying just one item.