Why do people buy Empty GSA Morgan Dollar Boxes with Certificates

Why do people buy these GSA boxes with certificates. Is it merely a collectible, something to showcase that particular coin, or used for more nefarious means? (Resale with a coin to try to show it is "certified" to get more of a premium from unsuspecting buyers?)
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The certificate number is based on the date of the coin. 1882s have a certificate where the forst two numbers are 82, 1883s begin with 83 and so on.
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<< <i>The Chinese needed examples so they can start knocking them off (copying them). >>
There are already many copies of the GSA Certs out there. I know a dealer in IN that had them custom printed. You really can't tell them from the ones that shipped with the coins.