I wish you all the best, but I'm skeptical that this could become a viable business. Is this a problem that people struggle with enough that they'd pay for a service to help them with it? What would differentiate Splitterbug from, say, BillMonk? Or just an e-mail? What are you planning on for revenue? One-off App Store purchases, or something more?
Using mobile devices to facilitate a shared buying experience with friends is huge. This app is a first step into this wide open and potentially massively profitable space. Discounting the future of the business from a landing page describing its very first private beta is not only mean-spirited but also shortsighted.
I also don't feel the need for this... This is a very micro, very niche product. Not a business idea.