One possible explanation is that you are just getting more responses (and thus more advice-based responses) because the Open Threads (and maybe Discussion in general) have more active users. Or maybe the users are more keen to participate in discussions and giving advice is the easiest way to do so.
It might help if you start.... (just kidding, I'm making a mental note not to give you advice unless you specifically ask for it from now)
Retracted because you haven't asked for an opinion on the reason as to why you are getting advice either.
In this context, the discussion is about receiving unnecessary advice, so I think speculating on why this is happening is entirely reasonable.
To illustrate why it's annoying, it may help to provide the most extreme example to date. A couple of months ago I made a post on the open thread about how having esoteric study pursuits can be quite isolating, and how maintaining hobbies and interests that are more accessible to other people can help offset this. I asked for other people's experience with this. Other people's experiences was specifically what I aske...
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.