I have one 1:10 house finished, the scale was a rookie mistake (from scratch) and one scratch build 1:12, currently working one the third.
I think the dollhouses for sale are way too expensive for me, especially when you have to import them to the Netherlands and because the saw, sandpaper and tape measure are my best friends. (at least I tell myself they are, infact I make too many mistakes measuring ;-)
I continue to make them by myself.