re: Why does the 53 man roster limit exist in NFL?

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First of all, why is it 53 and not 55 or 60 or 65?

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it's a business

during the week, your roster is the guys you have, the practice squad that practices with you but are technically free agents to sign with anybody, plus any dude anywhere you can sign that isn't on a college or another NFL team. i think for games it's actually 45 plus a third quarterback

you can't make such roster additions in the middle of a college season. that's why they have more players