Why do some receivers have cards and some don't?

satcrazy said:

Did a quick search but couldn't find anything, although this has probably been asked before.

Why do some receivers have cards and others don't? I asked a tech while he was troubleshooting a problem, and he just said some do some don't. He really didn't know the reason.

Are all the vip receivers card free?

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All DISH receivers have "CARDS" some are credit card size cards that slide into card slots. Some are chips built into the circuit boards of the receiver. The VIP models were produced with the last generation of chips built in so some have been updated with credit card style purple cards.

There are also some receivers on ebay/Craigs list that people have removed the cards