I think its very very common not to want to bother the samaritans
there are specific things you learn on (most) adviceline training. In particular, you tend to learn non-directional counselling / active listening techniques. Basically, this IS something most people can be trained to do. It is not really something especially prevalent on the suicide threads. BUT people posting on MN KNOW the deal, and counselling isn't a one-size-fits-all thing,
Sometimes people want stuff like , and also other people saying "yes I've been there, its shit, it gets better", or even "yes its crappy, but this is what you need to do" which basically you won't get off advicelines (you get support to work stuff out for yourselves).
I do agree that a few of these threads have probably been attention seeking and there is certainly a car crash contingent. But there are also a lot of MNetters doing Good Work.