I think it's natural and healthy to have a revulsion towards unnecessary excess.

It's not that they're $550, it's that they don't need to be $550. Choosing higher quality groceries, ordering delivery instead of going out during a pandemic, or even just buying things that will bring you and your children joy is on a different level than "I will get these $500 headphones instead of the $300 ones that do the same thing just because I can afford them".

Even if you're not explicitly trying to be as moral as possible with every purchase, there is a tangible difference between buying things that will improve your life or the lives of those around you, and buying things that are expensive just because you can.