> 1. Because real companies have accounts payable procedures, where transactions are examined and processed according to procedure, in varying degrees of time, depending on the circumstance.

> 2. Profitable companies, or those that hope to be so, make sure there is always a backlog of work available, which creates some amount of delay in all payments.

Your first two points are addressed by:

> Desperate, Bell called SpaceX’s senior accountant on Sept. 17 and left a voicemail. “I said, ‘Something seems a little weird, and I don’t know if I should be getting a lawyer,’” he said.

> Bell said he received two responses within the hour. The first was a call from the accountant, who told him his payment had been initiated and should land in his bank account in the next few days. Bell said that as of Oct. 9 it had not arrived.

> On Friday, shortly after the Chronicle reached out to SpaceX for the second time, an accountant called Bell and told him payment was on its way. Bell said this is the third time the company has told him payment has been initiated.

Your third point can go unaddressed.