For me, I’d guess it’s going to take 5 years to break even. I built a coop myself and it was around 2k in lumber from Lowe’s. If you get building materials cheap or can scavenge some you would save a lot. Feed is cheap.
2x on salvaged materials. I had a 16' car trailer I flipped in my 20s resulting in a bent spendal and racked frame sitting in the woods. I used that for my base to build my coop on so it's Mobil. The 2x4s to frame it I got on a scrap pass from work. They come in as cribbing in rail cars I had to knock out nails but did that at work on the clock between processes. The roof I made a single slop lean to from 2×8s a friend sent home with me when I was helping him clean up his place and pack when moving. He also sent a few rolls of new chicken wire. The roof tin I found in my barn that was saved from other recycled projects. I bought tin for the walls scewws and hinges. Ripped down the free 2x4s to Frame the door.
Total cost around $450. Been in use 6 years now. the trailer I bought for $450 at a pawn shop in Henderson KY when I was 17 and used it around 10 years before I flipped it(and jeep pulling it) so I had gotten my money worth before I destroyed it yet its gotten new life.
I'm not sure how many chickens we have but they all are at least 3 years old and need culled. Wife just picked up 20 new chick'sseveral different breeds yesterday and 2 few month old roosters I think copper Marians. Typically we several breeds laying a large variety of colors. Each dozen looks like Easter. Customers like it.
When we incubate our eggs we get some very interesting looking crossed up chick's and more egg colors and shades.