Quite the thread.
Over a little more than two years of vaping, I've bought 99 PVs, plus another five that were sent to me for free. Like the friend of his that another poster mentioned, I'm semi-retired, live fairly frugally, and though not rich, have enough disposable income/savings to indulge my hobby.
The first 77 of those PVs were fixed-voltage: 510 or eGo batts, box mods, tube mods, bottom-feeders, passthroughs, etc. Some use stacked batteries that allow for multiple voltage configurations as selectable-voltage devices.
The next 23 PVs (or APVs) I acquired were all variable-voltage (VV): boxes and tubes, single- or dual-battery units. This includes a ProVari, BuzzPro, and iPro, which remain in my opinion the best-built factory-produced APVs I have---all three feel to me like solid, quality instruments rather than mere functional toys. Among my hand-built mods, only the dual-18650 6-amp Penguin tin VV made by Caged has a similar feeling of dependable quality (my two Phidias wooden bottom feeders are beautiful works of art, but both have required multiple repairs along the way).
The last five APVs I've purchased are all variable-power/wattage devices: two Kicks, an Acrylimax (same chip as a ZMax, but in an acrylic tube), and most recently two Vamo units.
Where vaping is concerned, I am the only person I have to please. (I try to be diplomatic when posting on ECF, but attempting to insure a degree of social harmony is not the same thing as wanting everyone to agree with me.) While I read threads like this with interest, I have no wish to debate others or convince them that what I happen to think/feel/believe about vaping is "correct." And while others' opinions are interesting to read, I don't really care what other people think/feel/believe. Arguments about one thing versus another don't sway me, although the information that emerges can be very useful.
I like most of my PVs and still use all the different types: fixed-voltage, VV, and VW. Each has its niche and uses, and they all give me pleasure. With regard to future purchases, with the exception of a ProVari mini (which I might buy to complement my ProVari standard/extended), I doubt that I will order any more VV devices. I like VW and will probably follow that train out of the station for the next phase of hardware development. Other people can and---of course---will do what pleases them.