"It runs RISC OS, perhaps not directly on the hardware, but it definitely runs RISC OS."
It doesn't run RISC OS, it emulates it. It is a Windows machine emulating a RISC OS machine.
This is a significant difference. The PC in my old office emulates BBC Domesday, but it isn't a BBC Domesday computer like the Master sitting next to it. When I get around to it, I'm going to install MAME on my linux box, but it doesn't make it an arcade machine.
One of the best reasons for emulation has to be development. It's quite productive emulating RISC OS on a Linux computer, editing source and cross-compiling with GCC on the native side, and testing/crashing the software on the emulator, since you can carry on coding while RISC OS reboots and you don't lose your development session.
Marketting VRPC as a dev tool, with the ability to peer at low level operations, integrated cross compiler and so on, would be far more beneficial to the platform than migrating users to the dark side. I'd buy it.