Legally and morally no. However stickers don't normally add to resale value...
For what it's worth, and sadly I don't have a pic of it, but I use my Burgundy Mist Jazz in a P&W context. I've got a descending dove sticker on it. Squier Affinity Jazz, so not like I am worried about resale...
A big part of the sticker problem is, if you decide later on that you no longer want that sticker there, removing it can cause more finish damage to the instrument, and the finish will fade where the sticker isn't covering, and won't fade under it, so you will get some weird effects when you remove them... So if you sticker, chances are you are either going to need to refinish the instrument if you want to go stickerless as some point in the future, or accept some interesting mojo...