Targeting "only" iPad 2 with our app?

We are developing an Augmented Reality game for iOS (iPhones for sure). http://www.traveller-ar.com

With iPad2, we could possibly release it for "iPad 2" but not for iPad 1. (since iPad 2 has the rear camera, the Augmented Reality features would actually work).

2 Questions:
1. is iPad2 market big enough for this?
2. would we **** off too many iPad1 users?

Thoughts/suggestions appreciated.

Reply 1 : Targeting "only" iPad 2 with our app?

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