Looking up prices for a professional psychologist to administer an IQ test in Denmark, typical price is 3000-4000 DKK, i.e. 500 to 660 USD. Even commercial DtC sellers for microarrays go for 99 USD, likely to drop more.
One could probably optimize things further with CAT, but in the broad perspective and current practice, DNA will win because it gives you a measure (imperfect too) of every other heritable trait for which a predictor exists.
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