Let it go. He'll never understand how gpu rigs work, he thinks they all make $2.
Sadly, I think you are right, but sometimes the reply/explanation is not just for the person you are responding to, but for the others who might read the thread.
Not attacking him by saying that, all is good, but I've made several attempts to explain the pluses and minuses of rigs and how they work and he only seems to comprehend the minuses, so I just stopped trying on that specific point. Not a big deal.