Stop all the space exploration and wars and see how much money we could use for this planet. That would be a much better plan!!
Why?
It's not like they're shovelling the money out of an airlock -- It's still still spend in the (mostly national) economies.
Those millions of dollars are spend on creating good high-end jobs, manufacturing and such, and stimulate the economy.
Not to mention that all the research involved leads to new understanding of how things work, which in the long run can greatly benefit other more mundane technolgies, improving life for people.