Just finished watching Higdon Outdoors TV, week 10 and was floored by the size of their decoy spread. The spread was on a small lake with a peninsula running out in it. They claim that 2,500 decoys (over 208 dozen) were used, both duck & goose decoys. I didn't think that there was room for a live bird to land, but they tried. Most of the filmed birds coming in were small groups of 3-10 ducks. Not a goose to be found that day.
Granted it was on a hunt club property, but just imagine that work it involved placing and maintaining a spread that size.