The value you are referring to is from fewer people than you realize. It isn't about how much a few people will pay, it's about how many would pay to cover costs.
And again, these people are filmmakers! The director herself made this happen and not as a cash grab, but a fun opportunity for fans to connect with her work. Judging by the amount of time this has taken, I doubt she will forgo her budding career to make bank off a niche-of-a-niche market like indie horror film prop replicas.
We will see...