Sort of, I agree but it's not uniform. In general LF prices have probably risen much faster than MF, which is itself faster than 35mm.
There are cheap LF cameras around, I've just had to restored a supposedly nice Crown Graphic for someone, it had the rare optional Graflex back, totally useless it's wider than an International back, can't take Graflok roll film backs etc. It was in quite poor condition the seller had deliberately switched the back, a Graflex spring or Graflok back needs an extra screw and the hole was there on the body with a split because he'd missed it when removing toe original back
I've been planning to replace my Wista 45DX which has been my main camera for 30+ years, but has had a lot of wear and tear, and in the past 2 years prices have doubled or more, Chinese equivalents have rocketed up in price as well.
There's a definite rise in MF cameras but it's more Brand and Model dependant. I bought a really nice Rolleiflex Automat MXV with Opton Tessar 2 or 3 years ago for £70 (just under 490) it's used but most likely been serviced, but the value of my mint Rolleiflex E2 f3.5 Xenotar took a big tumble 15 years ago as did my M3 Leice when Digital became almost the norm. But demand and almost no new film cameras means values bounced back and have risen higher.
We can still get bargains . . . . . well I do
Ian