Pokemon card price values range from $0.05 to over $200,000 and the final price depends on factors such as rarity, condition, shape centring, proxies, type, set, year, print, edition, errors, language, and grading. In the end, a card is worth how much someone is willing to pay for it.
You can earn passive income from a self-service store with an ideal location, a loyal clientele, good business management, the initial investment required to build the business, and more. However, you have to outsource and automate parts of the business to make it a passive income stream. Learn more here.