I have two geese as well—have you found they help against predators? Anecdotally, we've had no predators steal any chickens since we added them (though a coyote got some goose tail feathers at first), though our neighbors down the street have been decimated by foxes.

Never considered the ROI, but I built a big walk-in coop for maybe $200 in materials. Think that'd pay off with the current price of eggs, if we sold them.

The geese we put to bed every night, and let out in the morning so they are generally locked away when a fox would come. A friend of ours has about 15 geese and pretty sure they have lost goslings to foxes.

They good at deterring delivery drivers though, and generally alerting people.