Square Enix should introduce some new guildhest that specifically rewards money. The prize should between 10000-20000 gil. To balance it out because of the large ammount of gil recieved, there should be a lockout. Lockout periods should be between 4-7 days after completion.
Rotate between 4 guildhest battles every lockout reset. Make them 8 man content with a moderate difficulty (gogochimera)
This will be an alternative way to get money.