If the purpose of art is beauty, then I think an artist would want to be there.
OTOH if the purpose of art is self expression, the artwork alone should be all that is neccesary. Having an artist present might just make people feel awkward.
But if the purpose of art is to sell prints, the ability of a potential buyer to schmooze with the artist "in the flesh" might make for a "value added" experience. Years later while showing off your original Ansel Arbus print of "Twin Moons Over Hernandez" you might recount how you and Ansel Arbus got drunk together and shot out all the street lamps in Afton, Wyoming....or something like that
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