Hehe, I know what you mean, I think the reason I have so many in the backlog is reason #3.  I'll start a project, full of enthusiasm, then hit the block and shift into "thinking about it" mode.  Till I pull another one out of the stash.

We could probably set up an assembly line someplace, and we each take that piece of the build that we like best.  We'd probably crank models out as fast as the glue, putty and paint can cure.