Like most Brickpickers, I’m not right in the head. I think that’s why I enjoy it so much. Everyone loves the chase or finding the great deal, the trick is learning to love selling. I only sell on EBay, which has different considerations verse Amazon sellers. Don’t buy every set just because it’s 50% off. Buy shipping boxes to fit your sets, most boxes are under $2 and are worth every penny. I stay away from mid-size sets [$50 ish] unless I have a good feeling about them cause fees and shipping take a big bite. Little sets under a pound are easy, cheap 1st class mail. Larger sets give you more margin and shipping seems more reasonable given their size and weight. A lot has changed over these 7 years but, still having fun.