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In a deck that only wants lands that make Green mana (Elves), the opportunity cost of including Turntimber, Serpentine Wood is extremely low
You can also break the symmetry of board wipes during the deckbuilding process, like if you run Bane of Progress in a deck without any artifacts/enchantments, or Retribution of the Meek in a deck without any creatures with power 4 or greater
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Legacy and Vintage-style testing: Dual lands are important for testing older-format mana bases in casual or unsanctioned settings
Whether its a huge financial commitment or a worthwhile investment, The Rayquaza-EX Dragon Exalted #123 card is something special to collect