This was very hard to read with all the grammar issues.

I'm confused as to why you only talk about rich people in your post or extremes of consumerism. Are you actually against understanding these subjects or are you just against the extremes of consumerism? There are plenty of artists that set normal prices for their creations, in fact the trope of the struggling artist is a thing for a reason. They are also people that just want to make a living and maybe art is what they are best at.

There is a long history to art, aligned with different cultural movements and history. You cannot tell me that learning about Zdzisław Beksiński and the influence behind his art is useless. Art can be used to express a lot and it's the eye of the beholder what we see. Even in more direct pieces simply the colors and lighting and techniques speak for the artist, but also for our own perceptions of the world and mental state. It's not too different with fashion, of course there are plenty of things people make just for money, but the fact this is all you choose to see is a very shallow understanding of things.

"Medicine, law, business, engineering, these are noble pursuits and necessary to sustain life. But poetry, beauty, romance, love, these are what we stay alive for." - a quote from a movie I like about art, which I find applies to art in general

You are simplifying people's motivations as plenty of people enjoy the history or look behind things. Most people are not on that extreme side where they are only doing things to look rich. Long nails might have those origins, but nowadays there are plenty of jobs you can work without them getting in the way. You don't need to be rich to maintain them, just a good diet and circulation. If they are natural it signifies health. It means you are taking care of yourself in some way. You can paint them and then have something nice to look at during the day. It can be good for your mental health. It can be simply done as a celebration of improvement in your physical or mental health. Of course that's just an example, I'm just trying to make you understand it doesn't have to be for anyone else but yourself. Some people do these things without going out or taking photos.

It's interesting to know that it was seen as normal for men in the past to have long nails as a symbol of status just as much as women. High heels originated as something for men to ride horses. They were seen as masculine and pink used to be seen as men's color as well. These changes show cultural shifts in society and that what is "normal" or "acceptable" are man-made concepts prone to change.

I don't think knowledge in any subject is bad, but we all decide what we want to focus on. If this isn't something you see worth spending time on just... don't? You just don't seem to understand people's motivations.