Lower cost to transportation is key for pretty much any economic growth. People and companies have significantly more plans than just a couple probes every few years. Exploration, mining, tourism, scientific research, manufacturing are a couple things that come to mind. There are probably many more ideas than what i can think of and that’s the point. Make it cheaper for people with ideas to make them a reality. When only the largest of governments can afford to put something into space then we won’t see much innovation/economic growth.