I have never used a plucker, but I have butchered quite a few chickens over the years, and I did not eat any feathers
I've done any of the following:
a) Fill the biggest cooking pot with water, heat on the stove until it boils, carry it carefully outside. Dip the bird for a little while (guess how long, pull a feather to check). Pluck by hand as soon as can be done without burning the fingers.
The feathers really do come out easily--no plucker needed. Just rub your fingers over the bird in the direction the feathers grow, and they come off in big piles. For the biggest feathers, grab one or a few at a time and pull.
The biggest problem with this method is that the pot of water gets cold. It helps (after some experience) to kill 2-4 birds, then heat the water and scald/pluck them quickly, then finish the butchering.
b) Dry-pluck most of the bird, either discard the wings or cut them off and scald/pluck at the end of the butchering session. (Got tired of re-heating water hot, and after a while one gets better at plucking--so dry was genuinely easier/faster sometimes.)
c) Skin the bird. For the wings, either scald/pluck them separately at the end, or discard them.
Thinking back, I think I would butcher about 6-12 birds in a given day, with various amounts of help from my mother and sister. This happened several times each year. At one point we planned for that one person needed about one hour per bird. Some years later, we were down to about 15 minutes per bird (skinning helped, discarding wings or doing them all together at the end helped.)
The flight feathers in the wings are the only ones that I feel can NOT be removed unless it's been scalded. (They don't come off when you skin, and I never tried pulling them with pliers.)
Edit to add: I'd sell them at $5 each, rather than butchering, unless there's a reason that meat from YOUR chickens is much better than store meat for your purposes. (My family was working with some dietary restrictions that made store-bought chicken not an option.)