Guilty! We have a "current" layout that will be taken down when we move, and thus I did not invest in ballast or non-reusable scenery. I'm certainly not looking forward to packing all those buildings up in a year or two! Someday, though, our future/permanent layout will be built wherever we settle down.
I also plan to run a ceiling layout through several rooms of the house, and am collecting a variety of tunnel portals in anticipation.
-Dustin