On amazon, there are plenty of listings for 36 booster packs that are part of the same set. Given that there is one land card in each booster, and each pack comes with 15 cards, you would receive 14*36 = 504 non-land cards. Given there are generally 180-275 cards in a set and the distribution of cards is mostly skewed towards commons, isn't there a very high likelihood of getting more than 4 copies of the same card in a purchase like this, especially for sets with lower card counts?
If so, do folks typically buy these sets for reasons other than deck building (drafting perhaps, or other reasons?) or would these boxes still be good purchases for those looking to get into deckbuilding for kitchen table games?