With the cost of film these days $15 seems like a good gamble, no? Probably what some film shooters spend on mustache wax or a couple cups of caffeinated barista concoctions.
Not sure if Fuji has any plants in Shenzhen, but it would not be unthinkable since half the world's product seem to come from that area. maybe this is stuff that "fell off the truck"? The reviews/order ratio might be low because it can take almost 2 months to receive the goods.
I think the scam is less likely about the items not existing and not being shipped as much as the items having been stored inappropriately or maybe even be manufacturing rejects. If I were a 100-speed shooter I'd blow $15 on the off chance that it's fresh film. ...and if it weren't maybe it'll be time to give the Leica a rest and pick up a Holga for a few weeks!