Well, there's only so many people you can fit onto a rocket of a particular size. And eventually increasing rocket size gives you diminishing returns, so there'

Well, there's only so many people you can fit onto a rocket of a particular size. And eventually increasing rocket size gives you diminishing returns, so there's an upper limit. Once you've used a rocket a few hundred times, though, most of your costs become things like fuel and oxygen, pad maintenance, and rocket refurbishment.