Should entry to galleries and museums be free for everyone?

I believe museums and galleries should offer free entry, at least on certain days, because cultural access shouldn't depend on income. In Shanghai, for example, the free admission days at the Power Station of Art make contemporary art accessible to students and retirees who might otherwise miss out. That said, I understand institutions need funding-maybe a donation-based system could balance accessibility with sustainability. What struck me was seeing families with kids exploring exhibits on free days, which really brings art to life for the next generation.