Charlatans, magicians, acrobats always have been at the heart of the Carnival in Venice.
In the St. Mark's Square blossom different stages for various types of shows, magic tricks, dentists, healers, Hope sellers, music, Puppet shows and Comedy shows blossomed during Carnival time.
And the suckers tourists coming from all over the known world for having fun in Carnival, gladly participated to the celebrations and eventually the rip offs.
Things haven't changed that much, in our modern times, after all ...