Milk spots are just another "layer" of lottery. Not only you need to figure out what to buy that has potential of price increase, but also if it will get milk spots or not. I paid quite a lot for 5oz 2014 Brittania. Last time I checked it was still "lactose free". I hope it stays like this as it sucks to pay a lot just to later have it covered with spots. Is there any "antique" minted bullion stuff, e.g. mintage in several thousands?