In case you haven't noticed graffiti art has gone mainstream. Spray paint art even has a new name; Street Art. Alice Fisher has an article in The Guardian explaining how Street Art has moved, with the help of the internet, from underground to mainstream acceptance by the establishment in short order.
From the article:
It's the anti-establishment movement that has taken the art market by storm, keenly collected by hedge-funders and Hollywood' s A-list. Now, even Tate Modern is giving Street Art its stamp of approval.