The vendor has to buy Blockland keys before selling them.
I don't think people here understand how stores work..
The stores BUY the keys with the CDs (although it still wouldn't be worth it because of what BobSeven said)
When stores buy the keys+CDs, it goes to Badspot, now if a store bought it for lets say $15, to make a profit they would need to sell it at a higher price, for example $20-30, so both Badspot and the store profit.
Now when this person uses it, it installs blockland, and UPDATES
If you really think of all the shit that has happened to BL, this would be moronic. They would have to buy each new version in order to even play it, and we could be trolled so hard due to the fact that if they sell for fucking 4.00$ you could buy like 20 keys and troll the shit out of everybody.
If you managed to get a v10 install of Blockland, it would UPDATE to the current version, so your conception makes no sense at all.