The card contains a popular first generation Pokmon that holds nostalgic value, Pokmon fans grew a special attachment to fossil species due to how they were obtained, and there are somehow not many Aerodactyl cards in print
The set also included a special gold etched Pikachu V and gold Pok Ball promo card alongside numerous booster packs and collector accessories
Despite the brands name literally implying a different thing (Professional Sports Authenticator), PSA has been grading Pokmon cards for decades, and considering a lot of value comes from its brand recognition, most vintage collectors and those looking to make quick sales use the service for investment or sales
You can have more, but I recommend sticking as close to 40 cards as possible while aiming for a ratio of 24 playable cards to 16 lands, adjusting for your curve as you see fit
Each slot had basically the same function even if the execution was a little different (scrying and drawing becomes draw and discard, for example)
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