A bit like buying a family car and having the rear doors and seats inaccessible unless you fork out extra for a special key...
There are plenty of features on cars that are unlocked in this way already. You just aren't appalled by it because you didn't realise. Someone I worked with specifically did unlock some feature by buying a different central locking key, but some are unlocked by hooking the car up to a computer. You can pay for some cars to have higher performance and it is just a case of uploading a different map to the onboard computer.
When you buy something you aren't buying the raw materials, you are buying what they create. If two things can be made with the same raw materials but one is better than another then of course one will be more expensive than the other. This is especially true in the art world, see how far it gets you arguing that you should be able to buy a Picasso for the same price as a painting you did yourself. Even if you use the same raw materials then something is different, even if you paint the exact same image.
Most people will not like this because they think they should get everything at the cheapest possible price, even less than it costs to manufacture. The alternatives are:
1. He just sells the most expensive one at the most expensive price
2. He makes two physically different cards, both more expensive because there is less economy of scale.
I'm not sure how either option is better.
