I have the same reasoning

I believe time frames or even "number of posts" frames are the best incentives to post OA.
There are dozens of questions, which are left without OAs and GMATclubbers are very confused and irritated because they do not have any idea, whether they solved that particular question right or wrong.
Thus, setting frames (personally I think that the frame related to number of responses (say 5-7)) is a very good idea.
Thank you for raising this question!
p.s. It would be even more better if
every member of the club tagged his/her question. There will be less confusion.
ooops, almost forgot another idea.
bb, I think that it would be great to advise GMATClub members to search for every question, which they want to post. Personally I do so every time before posting the question. What is the reason? There are a lot of questions, which were already discussed and solved correctly. Well, the reason against this idea may be tags problem. Older posts (e.g. 2006 year) are locked for tagging. But anyway, I would advise to search. Thank you for attention