That's because art is something to be appreciated on a wall in front of the actual piece, not from a 15" screen or whatever. Having a sense of the scale, the brush strokes, the paint texture are all completely part of enjoying a painting.
It's all very well people saying they don't like a Mark...
Paintings are also something that can be enjoyed for hundreds of years, a window into past generations. 500 years of enjoyment from Michaelangelo and Da Vinci, 200 years of John Constable and Joseph Turner, 120 years of Van Gogh, Henri Matisse...The value of art is something far greater than...