I agree a single in a large tank. Loaded w rock and pods is a mandys delight. However in most cases, draggonets are not the only fish in your tank that eats pods, add in how many folks will spend the money to add/ raise sufficient pods. This is why there considered hard to keep.
I'll give u myself as an example. One of my tanks is a 56 column. Prob 60-70lbs of live rock. In the tank are a 6line wrasse(podhunter) ,clown, fire fish, purple pseudo, yellow watchman goby, a pair of green mandarins and a pair of scooter blennys. I have no pods lol, all devour frozen foods tho. I trained them to do so. Once trained there a fantastic fish. Mysis, brine, prawn roe, cyclopese. All good food options