Make purchasable armor that is more revealing.
Every neckbeard in their mom's basement will fork out thousands to watch their tube top female toons run around killing aliens.
PS
[spoiler]if you make millions off of this please remember it was my idea ;) i have a few credit cards to pay off[/spoiler]
Credit to TheMaestroNoob -Deviantart
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Sex sells. Hardly an original idea.