Point is, what can the Provari do that many, many other comparable devices that cost less can't?
I don't know if that's a rhetorical question, in which case I probably shouldn't even attempt to answer, or if you honestly want to know.
What the Provari can do for me, is this: I can put a charged battery in it, screw on a topper, and take it out with me, and feel absolutely certain that it will do exactly what it's supposed to do for as long as I need it to. I don't feel that I have to spend a second worrying about it.
Maybe there are many cheaper mods with accurate regulation that could give me the same sense of reliability, but I haven't come across any yet. Other mods have crapped out on me, or at least become erratic, and to me personally, that is not something I want. Sure, I've heard stories of ProVaris not being reliable, but to me they're just that, stories. I've heard stories of meteorites crashing into houses too, and it's not that I doubt that those stories are true - but I don't worry about it happening to me.
That is just me, though. Preference is subjective (stating the obvious here), and the same goes for wants, and for many needs too. YMMV. Vape what you like to vape.