Oh, I absolutely agree. Licensing is where the big difference is at, but that makes sense though, as ARM and RISC-V are both RISC based processors.

It's loosely akin to comparing AMD vs Intel. Of course, you cannot pop-out an RISC-V and replace it with an ARM. However, the PCB's should contain all the same parts, meaning they'll have both have a similar price.

Unlike Intel/AMD, which you'd need extra capacitor, heat sinks, whatever - to help it handle all that extra power those CISC processors need (which results in heat).