Anyone complaining about the gil it takes for a double meld really needs to understand how to make money in this game. If you could have spent two weeks worth of "average gamer" time, so 28 hours of game time, which would easily make over 16mil (more if the coins are hot on the weekend). That would be enough to buy your double meld (unless doing BRD/DRG/WAR/PLD) and have enough to purchase (or just don't sell) the coins you actually needed.

The gil farming rate is 3mil/5hours on average.