There will always be someone who works for less. Always.
Every country has their immigrants who will work for less because they are "hungry". It is all over the world.
It is possible that sometimes people are faster than others. For example, maybe it doesn't take everyone 15-20 hours to prepare the t-shirts/sashings for the top of the quilt. Maybe it takes them 5-6.
Just like some will work for less, there are always people who develop their skills and work faster than others--and maybe even they are equally good.