Cost, durability, no leaks, I get what I want, how I want it and no more, bragging rights, oh and did I mention cost. I bought my CT for $2K and not counting parts from my existing donor trailer, I have less than another $2K in the build. Labor is not a factor since I work really cheap when I am working for myself. To get a toyhauler that is anywhere close to the durability of my CT it would cost me about $15K+ and I would have to accept the floor plan they have or pay a lot more money for a custom build.
Bragging rights is wonderful thing, Yes I built it, and as the husband and wife walk off hearing her ask him if he could build one for them. I just got on his scheisser list and he's wishing he had not stopped and asked questions.
Earnest