Like all "free-to-play" games, you can swap real money for pretend money, which makes building a Trojan horse parking space look like a good investment. You really, really don't "need" this money to buy more equipment to blow up bigger enemies -- we've already seen how they directly sold the ability to win for $1,300 -- and until recently the game's auction system was the ultimate scam. Say you bid 2 million credits on a sweet Vengeance starship. You don't get it. You bid 5 million and get the high bid, but then someone outbids you. You can't see how much they bid so you try 10 million, but that's not enough, so you give up and just lost 17 million credits.
A better investment, and actually less expensive. Really.
Every bid in the auction house was immediately removed from your credit balance, even if you didn't get the item. Even if you didn't get the high bid. The system made it possible to spend 100 million credits on nothing, or on an auction where you're the only bidder. You're alone in the dark throwing your time and money into an infinite void in the hope of beating other people you'll never know, making the shop a terribly accurate metaphor for the rest of the game.
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Another accurate metaphor.
This system was recently removed, triggering a backlash from the players (which is proof that online gamers will complain about any change). If a video game developer removed tumors from players, they'd whine about nerfing their loss in weight and access to radiation powers.