I have a couple more areas of interest besides Ghost Rares that you can look into in my PSA Showcase, the links in the footer
Dex 110 Cards Most Expensive M Charizard EX $743.89 $372.83 $285.73 Distribution by Kind Distribution by Rarity
The former will only be awarded once and includes various items (Hourglasses, Shop Tickets, Shinedust), while the latter requires the player to complete a specific objective in a battle to earn further resources
Many white cards search for Plains if opponents control more lands, generate Treasure when opponents draw cards, or provide symmetrical mana advantages that scale in multiplayer
Have to say that that Gym Challenge one is not badapart from the end crimps
In my experience, few card games wear out to the point of unplayability, so instead of spending hundreds of dollars sleeving every game that's passed through my hands in the past fifteen years, I've spent approximately US$20 on sleeves, along with US$45 to buy two replacement games