So I finally got around to making a small conversion table, if you will, converting some of the common in-game doubloon amounts into Euros, just to get a better feel for the cost. https://docs.google.com/spreadsheets/d/1GdW79l1hAu7cDeP6R-zKDkR6F6M2Jjv0YJLdUULC-hE/edit?usp=sharing   The C column is based on the conversion rate of the 14,500 doubloon chest and the E column on the one for the 30,500 doubloon chest.   Upshot - if you like to buy economy flags, buy them in the game, not in the store.