Personally I have never bought new camera since my first auto-focus film camera back in the 80s, a Nikon N8008; all of my digital cameras have been second-hand, and I upgrade as I run into limitations. The D50 I started with would miss focus in action shots because it only had 5 focus points and I wasn't always able to ensure that the desired subject was
on a focus point. The D5000 that replaced it was better, but then I ran into poor frame rate when shooting continuously. Replaced it with a D7000 which had a better frame rate but ran out of buffer after only 8 or 9 frames. The D7200 improved on that, but I've always found its low-light capability quite limited. My current D500 pretty much took care of that issue. Now this didn't happen over a matter of weeks or even months; the D50 was fifteen years ago, and I've had the D500 for only four months now. The longest-used body was the D7200, which was my daily from
I have not replaced any lenses in that time, only added as I felt a need for something. I replaced a very poor 70-200 kit lens with a rather nice 70-300 Nikon lens, new, back in 2012, which is
still my go-to lens for sports and wildlife. I kept the 18-55 kit lens that came with the D50 through all of the other cameras, as it was actually quite nice, even without VR. My only other lens purchases have been some specialty lenses, like a fish-eye, a 10-24 super-wide-angle, a 30mm 1.4 for speed, and a 70-200 2.8, again for speed. None of those was new except the 10-24, and it was reduced to nearly half when I bought it. The others were
eBay or pawn shops. I also have a number of other pawn shop legacy lenses from Nikon's film days, like an 85mm
f:1.8 manual focus and a couple of different50mm lenses, one AF one MF.
My point is that I got stuff when I saw a true improvement against a limitation I had encountered with then-current equipment, not just because, "Oooh, this is the latest and greatest and I
need it!" I have a number of lenses, but only two that I bought new, and each one had a purpose for me, even though I don't make my living with this; they represented something I could afford, and something I wanted to experiment with. My longest-lived camera was the D7200, from late 2018 into this year, although the D700 went almost as long.