Quoted from phil-lee:

Current astronomical pricing for Pirates is unsustainable and will continue a downward trajectory in value, becoming more pronounced as new movies featuring an Actor other than Depp are released.
It will quickly be "Yesterdays news" much like many of the older Titles todays younger Buyer has no vested or sentimental interest in.
There will remain the well heeled older Buyer who already has one or more exceptional versions already in their collection. It will have less staying power then Fireball, which continues to enjoy high collectability value. But Fireball desirability has waned dramatically the past 5 years and its decline will accelerate further as time passes.
Elvira always was and continues to be a high-niche genre. Outside of Comics, nerdy film fans and Pinball she is quickly fading into obscurity, especially beside horror classics like Dracula and Frankenstein.
Doubtful very many Teens even know who she is, even fewer who will one day be willing to shell out an astronomical sum for a machine with then outdated electronics and sketchy parts availability.
Plue the various outrage social movements continuation paints a bleak picture for Boomers displaying overt sexuality and cleavage.
How popular are Jayne Mansfield and May West right now? Thats where Elviras future collectibility is going.