Price-Per-Piece and the Sticker Sheet

[prof1515]

I recently purchased a set of Duplo building bricks for my nieces and noticed that while the box correctly states "90 pieces" their website had said 91. I looked at the inventory on the side of the box and sure enough it added up to 90 pieces. But there was also a little symbol representing the sticker sheet (just some eyes to place on the sides of bricks; long, long ago these would have been printed on the bricks) at the bottom of this inventory. It seems Lego's website considers this a ninety-first piece. While it's just one number off the difference made the price-per-piece cost of the set appear to be 32.956 cents per piece while in reality it was 33.332 cents a piece. Not a huge difference but it is still a difference and for people looking for a good deal, something like price-per-piece is often a factor. I have not noticed this before but then again I rarely open the Lego sets that I purchase (most are for resale and it's been a long time since I opened a set that had stickers). Does Lego count the sticker sheet as a piece on other sets listed on their website or just the Duplo where adding a phantom piece has a greater impact on the price-per-piece cost?