Who knows?
SInce I can't see the post I can't even begin to guess the reason,but you are new here so my advice is,if a post of yours gets deleted, live with it and move on.Don't make an issue out of it, it happens to us all at one time or another.

Here is what I posted:
I found a keyword for my niche with 5400 global and 880 exact monthly searches.
There is already established site with the keyword in the domain with .org extension which is PR2 and in top5. I asked how accurate the keyword tool is, because when I looked at the stats on the .org site they only getting 17-40 uniques / day which in my opinion is very low considering 5400 / 880 searches and PR2 + top5.

^ that was my post, what's wrong with it? To me it looks like simple question.