The reason why its 75 per key is due to the fact that they have to reprog the ECU to accept new keys and to also prog a key.

I bet when you take it to the dealer they will ask for all the keys to make just one.

Atleast they are suposed to cause if the programmer screws up it could delete some keys off the ecu and then you would have a key or two that might not work. They should check each key when they are done prog the new one.