Vandenkolk is now 17 -- and he's still legally blind. His uncle and legal guardian, Randy Melthratter, said that after the crusade no one from the ministry followed up to see how the 9-year-old was doing.
"I said, 'Will, honey, does it still seem like your eyes are getting better? Is it getting better? Do you notice anything better at all?' And he just kind of cocked his head to the side and said 'I think God's just taking a break,'" Melthratter said. "And that just tore, that just hurt. That hurt a lot ... a little boy making excuses for God."
"I got caught up in the moment," Vandenkolk says now. "Being as young as I was, thinking this could actually be possible. ... I just started feeling sad a little upset that this really didn't happen."
Hinn was at a loss.
"These are things that I cannot explain because I am not the healer," Hinn said. "I am human like you. I make mistakes like anybody else."
Hinn's answer is that God heals people in their seats, and that he, Hinn, is not responsible for what people claim once they get onstage.
"Over the years, there's been some cases where people did come up who said they were healed, but really they were not healed," Hinn said. "I do believe it's possible for individuals to mentally convince themselves they are, but that does not deny the real healings. That doesn't dismiss the fact that a lot of people are really cured."
Hinn Ministries told "Nightline" that they set up an account in Vandenkolk's name that now holds more than $15,000, to provide for his "education and health."
Hinn may be more confident than the team that surrounds him. Over the course of the "Nightline" interview with Hinn, his publicist started to interrupt, angrily.
The atmosphere got charged when talk turned to an ongoing probe of Hinn by U.S. Senator Chuck Grassley, R-Iowa.
Two years ago, Grassley launched an investigation into six major televangelists, including Hinn. Grassley is asking whether Hinn and his colleagues are using tax-free donations from believers to fund lavish lifestyles.
Hinn, for example, flies on a private jet and has lived in a beautiful home on the Pacific Ocean.
Hinn had never before granted an interview on the topic of the investigation.
He said he was "absolutely" confident that he is using the money appropriately.
In response to criticism that he leads a lavish lifestyle, Hinn said, "it's always been that by the way. That criticism is nothing new."
He flies in a private plane, stays in fancy hotels, wears nice clothes and jewelry. Does he not have any misgivings about that?
"No. Look, you know there's this idea supposedly that we preachers are supposed to walk about with sandals and ride bicycles. That's nonsense."
Jesus Christ may have lived in poverty, but Benny Hinn makes no apologies for living large.
"I mean look, every man of God that I know today has a nice house," Hinn said. "And they drive cars, and they have BlackBerrys or iPhones or whatever. It's what we need today to simply exist. ... Absolutely I need a private plane. For the ministry it's a necessity, not a luxury. ... It's a necessity for me to have my own private plane to fly so I can go and do what God called me to do around the world. If I should fly commercial I would wear out. With my schedule? It would be madness."
What is his salary? I asked.