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This proposal is a Work In Progress.
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See also the Experience Costs in the book.
In the current form, the system offers very cheap first and second dots in abilities. At a cost of 3xp, the first dot is in effect a very large step up from having nothing; in a third of the cases even the difference between getting a penalty die or not even being able to roll. The second die “doubles” your Ability—ignoring Attributes for the moment—for just 2xp or 1xp.
The higher dots cost progressively more. Yet when looking at it through the mathematical lens of seeing what the higher ratings do for a character in the system, they offer only slightly increased benefits (in the form of unlocking access to certain disciplines) beyond a simple increase in expected dice roll results.
An analogous argument can be made for the costs of Attributes. The greatest benefit of an increased Attribute rating is a larger dice pool, which in turn increases the expected dice roll value. The increase in expected value is constant, whereas the price per dot increases.