The Beale Ciphers, despite the attempts of hundreds if not thousands of cryptanalysts, have never been broken before, and might never be broken in the future. Two of the three pages that Beale left behind are still shrouded in complete mystery, and likely will remain a mystery unless someone manages to find the key that Beale used to encode the ciphers. In all likelihood, all the cryptanalysts working on the cipher are wasting their time while hoping for an outcome that will never come. So why are so many people so interested in cracking the Beale Cipher?
The first and most obvious, though perhaps not the primary answer is the promise of wealth. Allegedly, the rest of the Beale Ciphers will lead the one who cracks the code to the treasure trove that Beale hid somewhere within 4 miles of Buford's Tavern. This was the primary motivation of the cryptanalysts during and immediately after Beale's time, because everyone wanted to be the first to solve it and get Beale's fortune. However, as time went on, hope of getting the money slowly faded, but people still actively try to crack the Beale Cipher. For them, the pursuit of fame, glory, and the unknown is enough to keep them going. Being the first person to solve a 200 year old, perviously unbreakable cipher would certainly be neat, even if the papers didn't actually lead to a $20 million grand prize. Their name would go down in history along with Babbage, Kasinki, and Bazeries as the people who finally cracked ciphers that completely baffled everyone else. It's a similar story with the Zodiac letters. Two of the letters have been decoded, but the remaining two are still completely undecipherable. Despite the many failed attempts by amateurs and professionals alike, many people still actively try to solve both ciphers, though not as much for practical purposes as for the thrill of the hunt.