Create a Memory Palace for Digit System?

I’m curious to know how many of you all created memory palaces for your 3 digit system? If you have would you say that it was a good investment of time or would you recommend that someone simply do speed drills and memorize often to master one’s system? I’m particularly interested in ones experience as they initially “started” mastering their system and if a memory palace proved to be effective.

I have also seen a lot of memory athletes memorize the digits of Pi. I am wondering if the primary reason for this is having a fun way to review numbers rather than daily going through flashcards or a way to mix up one’s routine. What are your thoughts?

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