Good topic. I sold a home years ago and tore down my basement sized layout. I was however able to leave my Rail Rax on the wall as the buyer said her son would use for his diecast cars.
However, we will be downsizing from our current home in a few years, and, as depressing as it is to me, I'm pretty sure my current basement filling layout will have to go!
Selling with layout will only appeal to a small sliver of potential buyers. When I want out, I want out and will need the monies for the next home.