Scalability of Launch Vehicles for Tourism

Hi everyone:

Clearly, by scaling up a launch vehicle to carry more passengers, you
should be able to reduce per-passenger costs.

But my question is, what types of vehicles are easiest to scale up? I'm
thinking, especially, of HTHL (Rutan) vs. VTVL (Carmack). My gut
feeling is VTVL, but I was wondering if some more educated people could
help me out with this.




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