Dan,
I’ll go out on a limb and try to answer your question, or at least give you my opinion (yes, I know).
We live in a litigious society; basically, anybody can be sued for just about anything and who knows what a jury might do. If I recommend ULTRA GRIP UNOBTANIUM brake pads and you have a wreck, am I going to get a letter from your lawyer?
A lot of people don’t respond because of what I call “snipers”. These are the people who wait for someone else to answer and then try to shoot them down. They are a minority, but they can be a real nuisance.
I think the main factor is that this is a relatively “young” forum. It does not yet have a high volume of traffic and people have not had time to get comfortable with faceless strangers.
Just my nickels worth.