I have only seen the community card show up in live stud games. The ones where no one is folding.
I find your bet in that spot to be interesting. I think, in some thinking games, it might get through. When it checks though to you--you know from the cards there's not a lot of risk of trips, straights, or flushes--being out there, it becomes hard for an open pair of kings to call and for a small two pair to call.
I just don't think it works all that often in this spot (since no one is folding
hands that they should be and they probably aren't thinking too hard). Then again, with such a big pot, it doesn't have to work very often. It's obviously a +EV bet even working less than 10% of the time. Did it get through?