Cutting in line saves you four minutes and tells everyone behind you exactly who you are.

Skipping ahead buys you a few minutes and broadcasts something much larger, which is that you decided your time was worth more than the time of everyone standing there. Nobody says anything, so it reads as free. It is not free. It just gets paid in how a room of strangers files you away in a second and a half.

The next time you notice yourself calculating whether anyone would object, treat that calculation as the answer. Wait your turn. It is a small cost with a strangely good exchange rate.