Not every item is the same
A modern mass-produced 8x10 photo is worth pennies except for the autograph. A sticker on the back isn't a problem IMO, and I'm not very bothered by a discreet and unobtrusive one on the front.
A sticker in the white border area of a signed litho (such as the Paluso litho series) doesn't detract from the item either IMO, as long as it doesn't detract from the image or the signature.
As for signed cards, photo cards, postcards, etc., a sticker on the back of a blank-back item, especially a modern item, doesn't diminish the item to me. Covering up pictures or text, OTOH, is absolutely unacceptable to me.
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