I saw David (unique, magnificent !!) A few years a...

I saw David (unique, magnificent !!) A few years ago. I bought the tickets through the museum website, for adults one price, for minors, students .... reduced prices, free. Today is no longer possible! To book a month before, there are no more tickets !!! Book a theft on the "official" sites !! Reduced tickets ... are missing! Students, kids have to pay like an adult !! And yet quite a lot! But it is normal that the money I pay is not all for the museum, which it deserves and needs !! ??