It seems like a waste of computer resources to maintain that much data that is no longer relevant. Either that the amp has been repaired, destroyed, sold, or the OP has passed on. They should be available to read but not drug out in to the current day light.
You would be surprised how little resources it takes to carry old threads.
Some things that grind on resources are thousand post threads.
Repeated indexing and multiple simultaneous searches.
There was a Vb bug that allowed multiple logins/repeated-edits that was used to crash marginal hardware. Buffer/stack overflow kind of thing.
Flat text takes surprisingly little room or overhead.
As far as properly buried goes I'm on the fence. I can seal off threads on several forums and do . On the two technical forums I leave them open because what's new is old so often and I'm dealing with an educated membership capable of search functions that the Vb or Sm template doesn't have. For those that I don't poke my proboscis into , eHam leaves them open , 'Zed closes them off , Misfits and AMFone leave them open.
I know why 'Zed closes them off . Think about it . There is no mystery to Freedo.
It's all about volume.
It has to do with the type of membership. If it has to do with IQ there will be "issues".
If I'm dealing with MENSA members or morons there are always problems.
If I deal with the mean portion of the curve there are few issues.
Thing is,
I am rarely if ever anywhere near the mean portion of any statistical curve of any description. What does that say about me ?