Cues are works of art, even the production ones. Many are also limited.
People are collectors and the value of collectibles is determined by the desire of the collectors.
Just because something cost $100 to make doesn't mean it's worth $100.
An item's "worth" is the price that people will pay for it.
And many people's desire for these cues is obviously worth the price they pay.
That's how economics work.
Now that said, many manufacturers (like Predator) severely underestimate the amount of people willing to pay huge money to buy their "limited" products, and thus lose literally millions of dollars by not producing enough of these products--- and scalpers thank them.
When you see items being constantly scalped, the original seller is severely underestimating their own product's demand/value.
Predator is a gold mine that has diamond mine potential, they just need to bump supply to meet demand.