they'll know to shy away from those set-ups and look for something more natural and convincing looking.
Shhhhhhhhhhhhhh Anat! Your giving away the secret! Many folks don't realize YET that you can suck the ducks in just for not having a spinner in spinner country.
What's funny is that one of my hunting partners used a spinner the last week of the season. That's the only time he used it. He put it at the other end of the field to keep the birds from landing there and smoked em 3 days in a row. I have gotten to where I just hate the things...but that was an intuitive use of it.