Supply and demand my friend. Prices will always fluctuate, right now its prob just a hype/phase. do u want to be the person who owns a ton of expensive beanie babies that are now worthless after the phase?
Also cards pack were the OG "loot boxes", except with cards at least u got something in real life, some printed paper
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lol but yeah people do buy at the high prices, i have played yugioh competitively and if u don't pay u dont win, skills can only take u so far. I've sold my fair share of $100 cards and bought my share of 70$ cards.