I am a vet - graduated in 2012. I am in the process of opening a clinic in our town because of the reasons listed above - PE eating up everything, corporate medicine costing an arm and a leg, among other reasons. Good medicine can be practiced without it costing an insane amount - generally speaking. Drug costs have gone up, staffing costs have gone up, etc. I am doing what I can during my build-out to keep costs low, re-use as much as possible in the existing space, buy used equipment, etc. to keep my costs down once I open. Decor is coming from Goodwill/thrift shopping.
Often times these 'country' vets that are not charging cardiac monitoring is because they are not, in fact, doing any cardiac monitoring, which is obviously not ideal. That being said, I practice good but practical medicine. One of my favorite phrases from Dr. Willard in vet school was "Do you want this dog or a dog?". As a frugal person myself, I can't see spending as much as some of my clients do at some of the clinics I work at (been doing relief for 8 years now, associate prior to that). I feel if I wouldn't pay for it, neither will my clients. Some costs are out of our hands - histopathology, lab costs, vaccine costs, etc. Newer grads are often slower at surgery too, so it costs more for them to do it - increased amounts of gas used, time spent monitoring, etc. But some costs are. Some surgeries are a lot because that surgeon doesn't want to do it so hopes you'll go elsewhere, and some are high because they require specialized knowledge/skill/equipment (think orthopedics).
There are a lot of factors that go into why things cost what they do, but I do feel it has gotten a bit out of hand since Covid. It isn't strictly inflation - it's private equity causing most of it. Now there's shareholders dipping their hands in the pots too.