I did this one season and I saw \more ducks than ever before./ I hear some say bad idea what you say
If you have a pond holding ducks, what good would decoys do? I do not see how that would improve it. And if you have a pond that does not hold ducks, I guess what is the harm in leaving decoys out there, but I doubt that would improve the spot either. Plus it will not take long for decoys to start looking crappy sitting outside all the time, I good way to ruin a good set of decoys.