But least popular does not at all mean "shittiest". Least popular means the fewest sales; if people were buying only because of the shirt they wanted, then you would indeed be getting the worst shirt. However, some people are buying based on what they think will be the least popular shirt, which changes up the mechanics quite a bit. In the end, the only good strategy is to pick the shirt you want to have, but not everyone will think that way. Some will settle for a less desired shirt in order to perhaps win the freebie. I don't see the same negativity in the concept you do.