Something I've noticed is fairly common in MFB competitions is layering 2 or more BB-10s on top of each other as the playspace. Is there any specific reason for this beyond having a back-up on hand if something cracks? I've never seen an explicit reason given.
[Unanswered] Why do some people stack multiple BB-10 beystadiums?
It helps prevent cracking by effectively thickening the walls