>>7422586Use as test beds for new painting techniques, or for new shades of US Olive Drab.
That or keep one or two and leave on the shelf next to your latest builds to see your personal progression in your builds.
I'll probably keep my old builds in a box somewhere until I find them in 3 years time and think "Wow, what a waste of space. I don't even have any emotional attatchement to these" and throw them away when I move.