Yep my coop is only solid on 3 sides. The whole front is open. The back wall is open 12 inches down from the roof all away across. I can close the front off easy enough with a tarp in the winter but so far I haven't needed to.
Shipping alone would kill anybody wanting to buy one. Plus why would anybody want to buy one built out of real lumber for 3 times the cost, they can go buy one made out of stapled together cardboard at tractor supply.
There really isn't a good pre fab coop out there. That is why most of us on here are against them. For the same amount most of them cost you can build a much better one from scratch.
I'm sure there is some unknown maker out there that custom builds 3 prefabs a year that somebody on here will...
Whats most popular doesn't mean anything more than it's easily found. I can find cherry coke at any gas station in the nation, doesn't mean it's better than cheerwine.