What is the value of a Klimp painting?

Gustav Klimp's 'Portrait of Adele Bloch-Bauer' is indeed a lovely painting but it cost me 20c to get a copy via the net! (Dial-up!) It was sold for USA$135 million! Kerazy! A composer of a song might get $30 for his composition. An author of a brilliant book might get $4000 for a literary novel, yet a painting such as this one is sold for millions! It's out of control.
The 'View of Geelong' sold to the Geelong Art Gallery for A$3 million has now been unpacked and will be on view in two week's time. Again, is it money well spent? Rice or was it Webber - the previous owner, could have just donated it surely....
W.