I have always built a layout whether yearly at Christmas time or all year around in the basements. During the years I have managed to collect more that I can ever run on my layout. A few years ago I sold off 90% of what I had. But as I look around I see the stash growing larger once again. For the last 10 years I have actually had 2 layouts. One in the house in Florida , the other here in Maryland. We have the house in Florida under contract for sale and I am in the process of moving it all to Maryland. Most likely I will sell of some stuff once again.