Good idea for a topic, Tommy, I'd save that one too, until I found a replacement. And there's a good story behind Chad's marble, so I'd keep that one too. And Bill, that marble looks like an asteroid or something - a keeper, for sure!
I tend to keep beaters that are rare, and something I don't collect, or rare and an example of something I want to collect.
Here's one of the former.
It appears someone had some fun with it . . .