If you are only running in a pen with field trial dogs i can see why you would want to see the yotes gone. But i do not see where someone who is just useing the pen to keep there dogs in shape would care. You are taking your deer dogs in the off season to keep them in shape, there are no deer in the pens and most deer dogs i have seen could not run a red or grey verry long with out a sight chase. So in order for the pen owner to make a little money they need the yotes to get a good chase. I Someone goes to a pen and stays four hours with no noise they are most likely to go back Unless you just drop them off and in that case you do not know what you have anyways.
Yotes do have there place in a pen just not in all pens and they do not need to be overloded with them.