For those Glitchen who become very, very deep in imagination (akin to leveling v. high indeed), perhaps there could be some kind of special reward.
For example: being able to place one signpost on an existing UR signpost to one's home street. (E.g.: I become super-imaginative after much gameplay, and am able to add a pointer to the Guillermo Gamera Signpost to Flipside and Cebarkul. Obviously there'd have to be a limit on how many streets could be added to any one signpost, or a special UI affordance, but that's doable, I should think. Heck, if necessary, the player's most-favored Giant *coughDevscough* could decide what street the sign goes on.)
This would encourage other glitchen to explore the streets of the very imaginative (and see the cool homes they may have built, and what they've done to personalize their streets) and also provide a way to encourage more home-street exploration in general.