I believe Tim just loves to build amps all shapes and sizes, he sells them to help fund the next project or two. I just missed out buying one of his small gainclones, they don't last long on the open market. Shame for the ones who try to resale for a profit. I think it goes against the spirit of these type of projects.
I must admit a lot them only a mother could love when looking at it but they give you the chance to acquire such a amp. And yes, just like the previous post a lot of times you step up for a better finish or more refined big sister.
I think as well, like in my case these amps are purchased for a second system to try out and play with, those tend to come and go much quicker than your main staple rig.
I recently seen some nicely finished ones, a far cry from some of the old ugly ducklings of the past; they still reportedly sound very good and isn't that what it's really about?