Its an interesting business question, "How much do we invest in supporting the old generation vs the return?"
Apple really hasn't set a way to price it. They could of course, they could price an iPad 1 version of IOS6 to see what the market would pay for the capability. But you get maybe one shot at that.
They could do an 'upgrade today' offer where you sent them and iPad and they gave you a discount on a new iPad, but if they sold you the new iPad at the 'loaded cost' (which is COGS + warranty support + inventory costs) it might not be as much of a discount as you could get by just applying the money you got on ebay toward a new one.
Apple really hasn't set a way to price it. They could of course, they could price an iPad 1 version of IOS6 to see what the market would pay for the capability. But you get maybe one shot at that.
They could do an 'upgrade today' offer where you sent them and iPad and they gave you a discount on a new iPad, but if they sold you the new iPad at the 'loaded cost' (which is COGS + warranty support + inventory costs) it might not be as much of a discount as you could get by just applying the money you got on ebay toward a new one.