Gold Sellers are using accounts taken by players who (Mostly) don't know anything about account security. The only one its costing is the player if they are stupid enough to leave there CC on the account and not remove it and recover the account.
This is selling stolen games that is bought with stolen CC's and costs game company's money,time and credit to stop. There is a massive difference between the two.
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You can't blame company's because the currency value in your country is shit (No Offence). No one is entitled to these games and saying stuff like (X cost too much so ill just buy it from Y even tho its stolen) just makes a person (Not u) sound entitled.
Save up, Buy it via a legit means or don't own it at all.