What do you mean with set up? That Sotheby's was involved?
It wouldn’t surprise me.
Increase in value = higher commission. Think about how many people probably visited their site to see if they had other Banksy pieces for sale after reading one of the probably hundreds of articles that have been written/posted about the stunt.
Me neither, but even then it's a win all around. Sotheby's wins, the buyer wins (not what he expected but something even better), Banksy wins...
@M_V started
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What do you mean with set up? That Sotheby's was involved?