The good that comes of commercial space travel is space travel. It is a type of travel that requires trmendous resources, not only money but minds, people who will dedicate their time to exploring and improving on methods. Those resources aren't readily available; you have to get people interested in something before you can convince them to spend money on it.
As for bionics; I have an idea that consciousness is determined to escape from the confinement of biology and moving into machinery is the next step. Mechanical hands means a small step but it's a step nevertheless toward brain jars that can be transported and interface with various machines. Then after that, neural circuitry that mimics a brain well enough to transplant a human consciousness inside of it. We're getting closer, horrifying implications be damned.