The Hero pledge level is at MSRP, but the Leader level is a slight discount off of the three items together. However, there are two main benefits other than cost from pledging through the Kickstarter:
1) Free access to all unlocked stretch goals. Depending on our final push, we are currently looking at probably around 10-12 items, none of which will be available through retail. And that's not including the Pledge Manager boost for shipping and add-ons, which will unlock even more items. Since this Kickstarter does not include shipping, that boost is guaranteed to unlock 2-3 more items.
2) Early access to the game. Our recently announced retail release schedule has the base game slated for release in March of next year and the two expansions following one per month after that. These games are being printed right now, and we plan to start fulfilling in December (barring manufacturing delays). That means you'll have the game 4 to 5 months before any retail purchasers.