re: Reliability, frequent use....
If there are many different ways to go to space, we're going to have to spend a lot of money to find out what's the best way. A lot of money isn't exactly cheap.
Besides, even if there is a great inexpensive way, it might not be ideal for specific kinds of payloads.
I can't see dozens of launches with weeks of assembly in LEO, before a spaceship leaves LEO for Mars, with a crew.
It's going to have to be an exceptional (therefore expensive) HLLV.
Raoul
