One can't be sure of the primary motivations of those who attend large concerts. There are those who are likely to bump into some of their friends in the audience. There are those who already love the music and pay to see a live performance. There are those who are intrigued by the programme and don't know whether they are going to enjoy it or not. This is of Busoni's Piano Concerto, composed in 1903 and the longest and technically most demanding piano concerto ever written.
Democracy is just too expensive.
And even they can only specialise in one or two issues. And this matter of subsidies is now entering politics itself. In the developed countries there are no masses any longer. We're moving into a totally different era and we're all confused.