Yes there is a thread in the Games and Rounds section where winners can post their big wins in exchange of an extra bonus. I think 7em7er was the last one to post a $200 win, and it was in August.
But you have not one chance on 1 trillion to get the 10 000 number, I think most of regular players here already got it in the multiply btc game at least.
You would have one chance on 10 000 to get it if the algorithm was working with integers but it is working with decimal numbers, so you have one chance on 20 000 to get it actually.