Why does Beckett have BCCG?

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In a landscape that is already confused with lousy authenticators, problems comparing grades between legitimate authenticators (PSA, BVG, SCG), why would Beckett which already has a reasonable grading brand continue to have this bizarre low end grading that is difficult to compare to anything else, that the look up only sort of works for on their site, and that doesn't even track for population reports.

Bought a card (56 Mantle) off someone the other day and selling it on eBay, already BCCG slabbed. It's a nice card, but the only thing the BCCG tells me is that it is authentic, beyond that their '9' isn't meaningful, it's a matter of staring at it to try to figure out what grade it would get through a real grading process.

The seller thought he was fooled into buying "a 9", and was disappointed when I said to him it wasn't like a PSA 9.