You know you're too rich when, during the Legends quest, you write the map of the Kharazi Jungle on a party hat instead of papyrus, and give it to Radimus Erkle.
You know you're too rich when you become the first person with the top-secret Money skillcape.
You know you're too rich when you get scammed out of 50bil and say "oh noes, my spare change!"
you know you're to rich when you can drop all your gold on the kalphite queen and kill it
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