Have you ever find any address with even a few satoshi in it? but lets assume that someday some one lucky enough finds one collision then what? next thing is going to take a few months or even years? this is like gathering thousands of keys and going on the street and test them one by one on every car and house to see if one of them could open a door to steal the car or steal from the house.
No never found anything. Of course there are empty yellow addresses scattered in the first 100 pages, and on the last page. But nobody ever leaves btc in them.
I liken the process to hunting for a specific atom on the moon.. Its like the world's worst lottery. Still, you can't win if you don't play.