I've had a build of a talkshow that some friends and I built. It was played around with that night, and then I didn't think much of it. Later I saw another server that had talkshow in the server name, so I thought I'd check it out. Turns out they were playing around with the build I hosted and partially built. I saw that build being used by that same person several times more, once actually having a bunch of people all adding on to it and always having lots of fun with it. I personally wouldn't have really used it again, but another took the build, and used it multiple times more then I ever did.
If you are so mad at people using your builds, play single player.