I've seen this happen in a few forums and you have to really understand where everything is boiling down to. On one hand someone may take the time to post a genuine question in a forum, recieve fantastic responses and go from there but there are some individuals whom lack the time so they decide to pull questions from a forum they may frequent to create fresh threads. Do I agree with it? Yes and No
Yes: Because when you pose the question in a different forum your bringing it to a different audience which gets different responses.
No: Because you don't want the duplicate content on the web.