Or maybe the posters heard the advice then found something completely different to what the advice on here offered and they are happy with that. They might be afraid to come back and post about it for fear of being told they made the wrong choice.
Harpcolum is very pedal harp centric. Yes I know there are a lot of lever harpists on here, but the majority of discussion centres around pedal harps and music appropriate for that. If you are a straight folk harpist you probably want to hang out with other folk musicians, even if they are not harpists.
This forum is simply one of the few resources available for newbies to the harp world. I’m sure they don’t abandon the forum out of a desire to offend. They probably just don’t relate to the majority of the discussion on here, or feel intimidated by some of the posts.