Best answer
TheEconomist
Market fees! Don't forget that Valve takes a cut for transactions on the market, so sellers have to mark up their prices to make a profit.
All answers
InstantGratification
Honestly, it's all about convenience. Why wait and buy in-game when you can instantly get keys on the market, even if it costs a bit more?
GamerDude123
CS:GO case keys are more expensive on the market mainly because of supply and demand. Since these keys can unlock cases with rare items inside, players are willing to pay a bit more to get them directly from the market. Also, buying from the market can be quicker than buying in-game, and some players are willing to pay the premium for convenience.
SkepticalSam
It's a scam, keys should cost the same everywhere.
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