I wonder if some dealers add those stickers/stamping a to standard issue CDs in an attempt to artificially inflate their perceived value to collectors?
We have some serious collectors within our community… anyone ever come across such a fake?
Years ago when I was collecting I came across fakes quite often in that vain. You could tell because the promo's were usually given a different catalog number, or towards the 2000s were commonly included in a slipcase rather than jewelcase with the coverart and either a sticker or small sheet containing a condensed version of the press release. Universal used to (around this time - '95-'05) actually have a stamp-style 'PROMOTIONAL USE ONLY' label printed directly on to the disc as part of the disc's artwork (i.e. the non-playable surface of the disc). I used to avoid anything that didn't have something to specifically set it apart from the released version - so if all indicators that it were a promo were contained only on the jewel case (PROMO USE ONLY stickers or stamps) etc. I'd give them a pass.
Most CD promos don't go for very much anyway, although I'm sure there are exceptions. A recent one that springs to mind is GN'R's Chinese Democracy, what's known as the 'Red Hand' artwork. Something like 25 copies produced for what was evidently supposed to be a re-release/variant containing some quite intriguing in depth liner notes from Axl that were absent from the released version.