Good question. I don't have an answer, and you are right, most look cute and seem cheap but are flimsy and fall apart and are not adequate for chicken raising. But they are all over the internet. Someone is making a profit off of a product that is woefully inadequate in most cases. I looked and looked, and finally I gave up and found a carpenter who built mine. Much better choice. I am not very handy with tools.
Further, a worse problem with many of those coops is that they advertise enough space for X number chickens when truth is that the space is barely adequate for one half of X number. False advertising and very pervasive.
Flimsy is bad if you have predator issues. I have every known predator, including grizzly. Even a racoon can do considerable (!) damage.
Even the carpenter was going to use chicken wire. I had to disabuse him of this notion and got him to use hardware cloth instead, and I purchased better hasps than he used, and carabiners, and made him install them. It is all good now.
