It's not likely that fragrances get watered down by sellers. It wouldn't be worth the trouble for them to get involved with a sprayer mechanism and try to reseal it--even assuming they have the equipment. And what about the rest of the juice? They'll need a bottle and sprayer for that part too. It's just not practical. You'll usually see whole bottles that are fake for very popular titles only. Sometimes bad storage conditions cause damage and affect the qualiy of the juice in an otherwise genuine bottle. There have been many threads here complaining about bottles from Fragrancenet specifically for that reason. Perhaps this is one of them?