Since they've proven themselves incompetent, why use them at all? I mat and frame most of my original artwork used for cards. And what I don't frame, I display on easels in rigid toploaders (alongside the matching card).
Never felt the need to get some minimum wage stooge at PSA to verify its existence, or "validate" the item when I know damn well what it is. Since we don't authenticate the original artwork of Graig Kreindler, Dick Perez or Willard Mullin, why would we need to slab or authenticate this type of art?
Not sure why anyone would actually pay for this "service" (or lack thereof).