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“You have to get a helicopter company last minute, that hurts,” Wallenda said. “There are things like that that come up that are completely unforeseen … $50,000, $100,000. These are big, big line items.”

Although the walk will be broadcast live on ABC, Wallenda said legal liability considerations prevent the network from specifically funding his preparations, materials and all the others costs that go his act.

He’s hoping thank-you gifts for donors will push the Indiegogo numbers up.

For $5, donors get a picture from the walk, for $10, an autographed poster. As of mid-day Tuesday, one person had pledged $5,000 for access to a VIP viewing area and dinner with Wallenda. There were no immediate takers for a private Wallenda-taught backyard wirewalking lesson, dinner and VIP viewing, for $10,000.