"It may fund development that would otherwise not get funded," he said.
The aerospace spokesman is hopeful Lansdorp and his team may one day say, "Mission accomplished." Even if they don't, though, they will likely reach other milestones.
"We can't predict how far they'll get," he said.
If the mission flops, Lansdorp has ideas about what the nonprofit would do with any leftover money: Donate it to organizations that support space travel, such as the Planetary Society.
You might be thinking that $6 billion would be better spent on Earth, but Lansdorp says the money won't mean much on our planet.
Besides, he said, "I don't have a business case to solve the problems on Earth. I have a really good business case to get humans to Mars."