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This is a no brainer. You make a pledge of X dollars to get this game off the ground. If the game does not meet the funding goal by the determined date the entire project is scrapped and you will never get charged for the pledge. Nothing lost.
If they meet the financial goal by the predetermined date they you are basically pre ordering the game and get a bunch of additional perks.
Example: If your pledge was for $50 you would receive a digital copy of game with 60 days of subscription (at least $75 value), digital manual, digital strategy guide, extra 7 months of beta access and invitations to all stress tests. Also one additional character slot, digital soundtrack, 25 founders points to spend on in game extras. And many more in game benefits listed in the funding tier description.
So basically for a $50 pledge you get at least a $100-$150 return….again, NO Brainer.