Krithika,
You are absolutely right in requesting this rule to be implemented in IL where only quality posts/threads/forums will add to an ILite's post count.
Pavi , that is a brilliant idea you have come up with.
Unfortunately if we eliminate the posts count from these threads, the posters need to be aware that though they have assisted fellow ILite by providing some information or guidelines since it was posted in a chit-chat thread, it does not count as a brownie point.
I have seen people exchanging recipes and other useful information on these threads apart from discussing day-to-day activities.It is upto the discretion of the user to start a separate thread if the context spans beyond confabulation.
This is the only caveat I can think of which might irk the active participants in these threads that it is not chitchatting alone that these threads cater to.As I mentioned earlier , the poster can always start a new thread with a specific query or information outside the chitchat thread so that everyone in IL can participate in it ,not limiting to the chitchat thread members only.
I can't think of any other ripples that this rule if implemented might trigger.My support goes to you Krithi..

HIP HIP HURRAAAAAAAAY !!!