As a passenger, if I'm in an aisle seat in FC, I'll often close the bin over my seat to preserve space for my seatmate and other FC passengers who board late. When I later see FC passengers looking for space, I'll point out the somewhat empty bin. I do this because I find it incredibly annoying when people sitting in the back of coach park their bags in FC or the first few rows of coach because they can't be bothered to carry their own stuff back to their sets.