It's now a part of art history, it would be a foolish move on the part of the buyer to not accept it. Banksy has reaffirmed why he's maybe the only contemporary visual artist today who counts as a household name. Although I guess we cuold debate whether he's first and foremost a visual artist, or a performance artist. The audacity of his stunts and trickery far outweigh the merits of his clever visual puns.