Imposing articles restriction is not going to increase the quality at all. The findings that Maverick has shown here is based on a limited period. But in long term it is not going to help because of following reasons..

1) If I want I can also post all the three articles as copied in a day. so this will not serve the purpose.

2) By imposing this restriction, boddunan is going to loose in long term. because there are lots of authors who write 7-8 articles in a duration of some days, and they post all those in a single day. but this restriction will discourage them.

3) Some other sites like indiastudychannel.com or hubpages.com they have not imposed any such restriction. Then why boddunan should do this?

Instead of restricting article submission, we can do one thing to get quality contents. Here is the solution to this problem.

"If someone is posting more than 3 copied articles in a single day, then ban him/her for next 2 days from posting. This will definitely discourage the authors from posting copied contents..."

I invite others suggestions in this regard...

Thank you