I can't say I've noticed it too much myself, really. I have seen simultaneous answer by different people or answers come a short time after another. I know sometimes personally, I'll start typing an answer, get distracted with something else, and then come back and finish my answer. In the meantime there might be a number of people who chimed in. Other than that, I don't see repeats. I see clarifications on certain things. A lot of the questions people ask actually have multi-faceted answers, so the first response may have unintentionally overlooked something.

You must also remember that sometimes two or more people might be answering the same question simultaneously.  I have often seen a new question and compiled what I consider to be a full and thorough answer, only to find that one or two other people have also answered the question saying more or less the same thing that I have said, but have simply pressed add reply a bit quicker than I have.  I've done the same thing myself and beaten someone else to the post - unintentionally.  Sometimes, some of us may joke about being quicker or slower or whatever, but so what?

If I see a question that has been answered and there's nothing I can add, then I leave it alone.  If I see a question that has been answered but I think I may have something useful to add, then I'll possibly add a +1 and a further comment.

It's the way the forums work.  For me it's not about points or being a 'big shot'.  I'm too old and ugly to bother about nonsense like that.  I don't believe for most regulars that it's about points or having to prove anything either.

Seriously I don't see the problem as long as people who are asking for help get it. 

I've noticed you seem to be fairly new around here in terms of actually contributing much although you've been registered for nearly two years but that you've been replying usefully several times recently to users.  Good on you for getting involved.  The more the merrier. 

No-one is trying to steal anyone's thunder or intentionally repeat the same thing in different terms - unless it's needed perhaps (remember that not everyone who comes to these forums necessarily speaks or understands English as their first language and that it is sometimes an effort for them to even try to get their question across clearly in English, so it can sometimes help them when replying in English to perhaps put something over in clearer terms).

And as has already been mentioned it sometimes helps if a number of people contribute to discussions whilst respecting the views and opinions of others without feeling the need to take a needless swipe at those contributors who do spend a lot of time here on their own time.

Keep up your helpful contributions.  People will appreciate your help just as much as they appreciate any help offered by anyone else.  I'm happy to learn from your expertise just as much as I'm happy to learn form anyone else's expertise.

Regards

Nick