The main reason for the Beale ciphers being so incredibly enduring and tough to crack is because they require a unique keytext such as a book or letter. This allows the cryptographer to be limitlessly creative in the construction of a keytext. It could be a personal letter or a well-known book. The motivation that some cryptanalysts still have to break the Beale ciphers comes from both intrinsic motivation and gain of wealth and fame. The feeling of breaking such a difficult cipher can give people a rush of self-satisfaction which can be enough to motivate anyone. Uncovering this cipher could bring joy to a true cryptoanalyst.There are also the gold, silver, and jewels involved which would advance the wealth of a code breaker.