The generic idea is that the women of the family deal with the fun of planning a wedding and that the dad will pay for it. While times have changed a lot and this is not what is custom anymore, one thing is still the norm: weddings and a lot of the items you need for a wedding cost a lot of money. And these items that are considered to be indispensable for a wedding can rack up a pretty penny.
Yet, you will never see them go down in price. Of course, there have been alternatives that keep popping up online, and you can buy certain things for a cheaper price, but sometimes you have to compromise on quality. This, together with the fact that people dream of their wedding day and want the best things for such a special event, is what drives the stores to keep the prices high or even rack them up higher than needed.
The companies know you want quality and that for a once-in-a-lifetime (most of the time) event, you will not compromise in order to make it perfect. So unless you are willing to spend even more time, effort, and stress to find the biggest deals (and even then, there might be hidden costs), don’t expect the prices to ever go down.