Not sure how lemmy compares but it isn't unusual for user generated content online to follow a 1:9:90 distribution of posters, commenters, and lurkers. Just look a the number of upvotes a post gets compared to the number of comments it has and you can tell that most people who vote dont also comment.
I rarely comment because internet discussions tend towards arguments. I usually just upvote comments that already say what I was going to comment anyways.
They also cut the fabric multiple layers high with a giant stamping tool. The more layers of fabric they cut at once the more variance there is between top layer and bottom layer but the cheaper the process is. Higher quality cheap brands will advertise that they only cut x amount vs what the competitors cut so they have less variation.