This topic turned from helpful and reasonable to some form of group bashing.
I completely understand the reasons for some of your anger/frustration, but this is not the right way.
In my opinion, any help is better than none. You can simply choose to ignore mean messages. If nothing else helps, a timeout will do.
A witch hunt like this will not lead to a change in behaviour, it only leads to more difficulties.
Regarding “throwaway” accounts, I think that making a special category for valuations would be all the help needed. The people that do want to help, can choose to do so then, the others can simply ignore it.
Forced policies or any other complications would, in my opinion, just hurt the forum in the long run.
I myself first visited this forum to get an identification for a coin, but this identification, although I could have easily done it myself today, lead to me getting more and more interested in the topic of numismatics. had I just gotten an answer like “do it yourself” or “do your own research first”, I would have most likely never even started getting interested. A few hours browsing through the catalogue later and I was absolutely fascinated of the subject.
TLDR: Sometimes, it is better to accept little annoyances like throwaway accounts or people obviously not interested it the topic, in some cases it would be worse for the forum and the spreading of the hobby. The first interaction with the topic has to happen somehow, after all.