That likely wouldn't have helped, because sadly some people still think it's funny to steal the actual town signs. I guess even if they'd sell identical 1:1 signs for a fair price, some people would still steal the installed ones.
Someone did set up a tourist shop selling T-shirts reading “I like Fucking in Austria”, though the locals found it a bit undignified. (Austria can be a somewhat conservative place, especially in rural areas.)
And it's right FUCKING there in the image anyway... I'm certain people do this consciously to get more "interaction", at least a few certain comments about it.