Everything Is Negotiable
The unique aspect about negotiating compensation with a game company is that the employment package often contains a royalty percentage based upon the successful sale of the game in the market. The amount of this royalty is based upon individual and group participation. The game industry rewards for the level of your creativity and your willingness to take risks. Although your counterparts in the traditional business world may earn a higher base salary, they probably don't have the same opportunities to "hit the mother load." Ask the ID software folks if they think the game industry underpays. The Quake II team shared millions of dollars.