The fatter you are the less weight shows. On that subreddit people like to talk about "the paper towel effect". They use it in regards to weight loss but it works for gain as well.  When you take a piece off the roll when it's full you don't notice a reduction in size but the fewer paper towels there are the size difference when you remove a sheet. Is much more noticeable. Well the bigger the roll the more paper towels need to be added before you notice the roll getting bigger. That guy obviously has a LOT of rolls so 100 lbs could easily hide under his tarps.