no other reusable rocket has achieved a cadence anywhere close that of Falcon 9.

But the whole point of the cadence was that it was necessary for all the startups that were going to start needing launch services. Without demand a non reusable rocket that doesn't require a weekly launch, landing barge operation and booster refurbish is perhaps cheaper and makes better business sense. I don't have sources, do you?

I highly doubt it. ^we're ^both ^guessing With minimal downward pressure on launch price from the rest of the market, they should have been able to make significant profit with every launch. I suspect this has been pivotal in bankrolling Starship development.

SpaceX have essentially become their own "widest market".

That sounds like a bazillion dollar business to me, when you're your own best customer.