A person who only acts based on the benefits to themselves is typically considered an 'evil' character.

You also managed rather badly misinterpret what I was talking about. A neutral outlook has nothing to do with a character seeking for balance of good and evil acts. What I was specifically speaking to is a character that isn't tied to either what could be considered a "good" morality, usually typified in a character that tries to better the world/lives around them through acts of kindness, compassion, generosity, etc, or an "evil" morality, usually typified by a character seeking personal gain, or the gain of a set group, through whatever means available regardless of justice, law, compassion, relationship, etc. A neutral character isn't necessarily seeking any change. That however does not mean they are not active, making decisions, decisions that could be viewed as either good or evil, not out of the interests of balance, but to serve whatever purpose that character is at (a job, a goal, a common interest, etc.)

What you're looking for is rather difficult to provide in that you do what to be rewarded for a character that has some level of balance of acts, rather than a 'good' character, rewarded for good acts but is capable and has had to make some tough/bad decisions, or an evil character, rewarded for being evil, but having at the same time done a few good things because it is personally beneficial. In a game it is impossible to really reward something that isn't 1 of those 3 (a sum of 'good' acts, a sum of 'evil' acts, a balance of the two). I am talking systematically, not psyche.