Of course that is how it should be done, but that is least-likely to be implemented by the greedy games industry, is it? They'll interpret it differently as with "cost when saving the most by our fancy bundles".
As I understand, there is also a rule that you must be able to buy an exact amount of premium currency for a specific thing you want. So if that's also enforced, clearly the price shown would have to be how much it costs to buy that exact amount of premium currency.
