Here is a picture of a kit home that I was recently called out to look at. It was built in the 80's. This is what happens when you build a kit and then don't strip, treat, and restain the home every 8 years. All of the corners are completely rotted out, and most of the walls are rotted as well. This home is going to be torn down. It will cost more to replace all the damaged logs then start over from scratch. Can a kit be kept up and in good shape after 30 years? Sure, of you don't mind spending a good chunk of change and time keeping them up. But most people don't like a home that is a guaranteed time and money suck.