Coming at this as a member of this community, I do not see the issue as simply a difference of opinion or that the costs are rising.
There was always banter based on opinion, such as who liked Popeye, Gilligan’s Island or Theatre or Magic or who really didn’t. There have always been conversations about how much someone thinks they can get for a machine, especially on eBay. Though even I can now say I remember the days you could buy a TAF for half what they now cost.
At the start of anything, there are a core group who are focused on making it work. A place to enjoy, like building a perfect pub where folks want to be. Over time, some folks go in a different direction, new folks join. Old folks return. The forum changes and is changed by its members.
The eBay thread is a good example of what I felt was very different when I returned after a break from the site. It use to be about pointing out good options or bad scams, keeping us from bidding each other up accidentally. Maybe talking about prices.
It now feels to be about judgement over what “others” are doing.
I don’t think that is the same as having an opinion or disagreeing with someone else’s. It is about having an opinion that in some way makes someone superior to others or is voiced in a way that could imply someone else is inferior. It might not always be the intention of the poster but it gets picked up by others and rolls on.
I might not want to spend £8k on a TAF that is my opinion. But if I was to say you must be an idiot for spending £8k on a TAF then I am doing more than just offer an opinion.