"It is also possible to pay for a subscription through the purchase of Eve Time Codes using ISK. This allows relatively advanced players to play the game withou

"It is also possible to pay for a subscription through the purchase of Eve Time Codes using ISK. This allows relatively advanced players to play the game without paying real money. A player may buy an ETC for real money and sell it to another player in-game for ISK. The system is officially and securely supported by CCP" So I'm not sure all 300,000 are paying customers - still very very impressive!