fvjr,
It's strange but true: there are dyed-in-the-wool utilitarians loose in the world who really couldn't care less about quality and style and fit and finish and high performance. And you will never be able to "explain" to these people why an Arc4 is not only worth the money, but is actually a bargain. And, it's really best not to even try.
But the simple fact of the matter is that quality is real and important, and this is testified to constantly. Is a Snap-On combination wrench set worth 10 times the price of a Craftsman set? That's an impossible question to answer definitively without further qualification, but plenty of professional auto mechanics have voted "yes" with their hard earned dollars. It takes a long time to really appreciate all the subtle differences and pluses to a quality tool, but when you do, you have no doubt that it was "worth" the money, especially if you use that tool on a regular basis.
For me, if it's something I will use fairly often, then I'm willing to plunk down the extra money. But if I will only use it occasionally, and the less expensive (but still decent) tool will do the job, then I go for that. To wit: I have a Snap-On 3/8" drive socket set, but a Craftsman combination wrench set.
We all make choices and judgement calls on these sorts of things, and, frankly, if someone doesn't see the point of a $200 flashlight it's best not to press the issue, for their own sake. Why spread the disease more than can be helped? Tell this guy that you don't have any good answers for him. If he doesn't see the need for an Arc4, so much the better for him. Others of us have so many (and expensive) "needs" that our spouses would never forgive us if we gave ourselves full reign.