[vitruvian]

Of course, if the modified cost of the two 'versions' of an ability are the same or comparable, and the Alternative Abilities rule is being used, you can just take the full limitation value on each version and never pay more than an effective +20% premium for each additional option.

For the example given of two -30% limitations, this would only save you 1% over the way presented, but for larger limitation values, it could add up.