But come to think of this issue of not contributing, if the poster is satisfied with the post, he can lock the thread or post to avoid people who are contributing or seeking to raise ideas as well helping them not being tag for spamming. Though I stand to be corrected as regards to this suggestions but I believe that is a way out where  a poster who seeking contribution of knowledge restrict people after being satisfied with what he needs.
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Most definitely,
Most definitely Mate.
Locking the thread would be  a potential solution to the problem of thread necromancy. If eventually, the OP of the a thread could lock their own thread once they've deemed the information already gotten from the thread satisfactory,  it would be a very clear and polite way of telling people that he is already satisfied with the information provided and further contributions will no longer be needed or necessary.

Although like we already know, everything that has an advantage also has its downsides, and the potential downside of that it'll prevent new users from discovering or contributing to older threads that might've still be helpful to them.