I think that it is just different (sadly) approach of GI. You just need to pay to complete event, no mercy. But as I see, every more complex game has the same approach, e.g. SimCity which - when you don't pay from some level - has very upsetting slow progress.Very helpful tool, if I remember correctly (unfortunately I didn't take any notes) same points to advance through event levels were required for previous event (Curse of the Valley of the Kings?). Would you pls check the end of the table - I believe there is no lvl21, so after 930 pts for lvl19 you should need 1,070 for reaching last level and the event building.