The grading holder does preserve the cards quite well. Better protection against fairly bad accidents. For less expensive cards a penny sleeve and semi ridgid is fine.
For the more expensive ones like the Mantle it's an extra bit of security. Plus it gives you serial #. And if you want to sell it eventually buyers will be more confident of it being genuine and unaltered. So it will sell for more.
Unless the commons are extremely nice it's probably not worth it for them since the grading could cost as much as or more than the card.
Steve B
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