Talk:A bag of low-quality diamonds/@comment-24389606-20160619170528

Has anyone else investigated the probability of the Rare success? It could potentially make it one of the best money making options.

Even if the rare success appears with 7% probability, for example, there is 93% chance of earning 5.4 echoes, and 7% chance of earning 17.78 echoes. That averages out to 6.27 echoes for every action (for a price of 200 Cryptic Clues).

Unfinished Business in Spite > Eavesdropping gives you 1-120 Cryptic Clues

Assuming the average for that is 60, you need 3.33 actions to get 200 Cryptic Clues, followed by 1 action to convert them to 6.27 echoes.

This would give out 1.45 echoes per action, which is the best repeatable, reliable, non-Fate based echo grinding option (as per Urthdigger's thread - Google "grinding echoes fallen london").