You ask a question well worth considering! And I think it's also well worth considering the way your question is formed. After all, when you ask, "What's the Point..." you have constructed it in such a way that there would have to be a singular answer.

The first thought that comes to me is that different people have different reasons for their entering museums. We see their action - going into a museum - but we don't know their motivation for taking that action. The motivations can vary tremendously. Consider some alternatives to why people have entered museums:

Philip has entered the museum because he wanted to be in a dry place during the rain.

Maurice has entered the museum because he just began dating somebody to whom the visit was important, and he wanted to impress her.

Colette has entered the museum because she needs to do an assignment for school.

I think you can see how each person has a different motivation: a different "point" for entering the museum.

I am curious about something you said, concerning that works of art "seem out of place on a museum wall." What would be the alternative(s) to having them on museum walls? Hang them in cafes, in Metro stations, or in private homes? It seems, at the very least, that when art work is aggregated in one place, it affords them a good opportunity for them to be protected from harm.

Please note that I have no intention of attacking your perspective or phrasing. I can see that you enjoy museums and art, as I do.

Many thanks to you for getting me to think about this so early on a Saturday morning.

Wishing you only the best.