The 'Audiophoolery' thread must also be a strong contender! Still rumbling on since Oct 2017 with no sign of a let-up. Almost 1,600 posts from 160 posters, with the top five most prolific posters (3% of all posters in the thread), accounting for 718 posts - 45% of the total. Almost as passionate about 'audiophoolery' as 'audiophools' are about their coveted toys!
Then there's AVO meters of course, and DAC90As which must be in with a good chance, with 'where can I get an idler wheel for a Dansette?' gaining ground.
(Errr, did I mention the Sussex?).