"Using RO4+ ROM images on RPCemu is, I think, pretty much a blatent licence infingement,"
Surely that wouldn't apply if the user bought VRPC and used the provided RO4 image with RPCemu instead of using it with VRPC?
Re your point 2: before we had VRPC it was possible to transfer a ROM from a dead machine to a working one. E.g. if an RO4 machine died the owner could transfer the ROM into a working RO3 machine. Does the same not apply to VRPC?