I make 40k a year due to not growing up wealthy enough to attend college, I should be subsidizing people like you?
They're valuable if you don't want to live in the world depicted in Brazil (1985), or Neuromancer, or pretty much any cyberpunk dystopia.
For context, I give 8% of my humble income to charities that feed the hungry and care for the sick. Is my dollar better spent funding a play that few will ever wish to see?
As far as I'm aware, none of us are allowed to pick and choose what our taxes go to or else I probably would give more to the arts than, say, the military.
So, the crux of your argument is: because money is squandered in one area its fine to do so in another?
All I said was "hey maybe you're right there isn't a tangible value in terms of money in and money out but perhaps there are other, more-difficult-to-track reasons why the arts are important."