i think it is just fine to 'ladder' different condition copies of a card. It gives people who get knocked out of higher conditions the ability to drop down. It really works best if you allow anyone to bid into a lot in OT the way Sterling does. But I sure don't want to see ten PSA 2 of the same card.
When it comes to mainstream cards, I don't think it is realistic to assume that my example will be the only one in the auction. You'd never get to all of them.
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