Using the moon as a staging point for onward space travel doesn't make much sense. For example, it's roughly 200 times as far from the Earth to Mars as it is from Earth to the Moon.
As an analogy, let's assume that you wanted to travel from Oxford Street in central London to Manchester (approx 200 miles) by a vehicle which would need refuelling along the way. Putting your fuelling point in Regent's Park (one mile away from your starting point) wouldn't help much!
Chris



