The only drawback would be that feeding organs alone is not complete nutrition, but since you also feed pinkies that is not a concern, so i'm sure it is a relished treat for them. I catch a lot of crappie and walleye and have often thought of doing the same when cleaning fish. I also thought of feeding the crappie eggs during spawn, but to me it isn't worth the risk of adding a pathogen into my collection so I never have. Instead I let my box turtles have those treats, since they are kept outside with a pond that could have anything in the water that the fish would.