The owner originally allowed these artists an opportunity and a venue to express themselves at no cost, and when he had decided it was time to move on, his kind gesture was met with hostility and greed on the part of the artists.
These artists may have gotten their payday, but in doing so now every building owner will think twice about allowing artists to paint, and their fellow artists and the general public who enjoy this kind of art will be the ones that suffer the consequences the most.