Thanks for comment. It doesn't matter if the rocket costs $20m and fuel $300K if you want to send a payload 2 ounces heavier than the fuel to be used. You might be right about the business math, but I just haven't seen anything conclusive on the economics yet.

You seem to agree that there are huge technical problems with more powerful engines. I'm sure everyone is working on reusable rockets. Again, I just don't see the kind of progress expected. Not even close really. But that's just me ;)