Once you learn how to master your setup on a bird, you no longer need decoys.
The only way to master you set up is to screw up 1000 set ups before it clicks. Failure is the BEST teacher when it comes to turkey hunting. Been there done that, and yes, I've screwed up WELL over 1000 set ups.
Every time a bird doesn't commit to your calling there IS a reason. Figure out what you did wrong and don't do it again. And even if you did nothing wrong, they still sometimes don't commit. Tip your hat to the better man that day and do battle with him another day.
I just wish I could get in the game this season!