Banksy makes Graffiti seem like Portrait Painting

Banksy piece in London. It features an artist holding a pallet, and painting Banksy's graffiti letters, not with a spray can, but with a paint brush. This piece could be interpreted to mean that Banksy is elevating graffiti and street art to the next level. Or perhaps it could be a message to folks who aren't fans of graffiti, pointing out that 'Hey! Graffiti is painting too!'. As a piece of art, quite impressive shading on the stencil. What do you think this piece is about? ***Pics from The Lonely Villian on Flickr***