Fairy Tail needed the money.
For the past seven years, they tried to keep their guild alive as much as possible. They could have picked a fight and might have won this round, but if they had, the guild would have been completely destroyed shortly after by Twilight Ogre.
Master Macao, The Fourth, did not want to risk this as they didn't have much job opportunities as it is, let alone if they had to pay for hospital expenses and repair expenses additionally.
Also, Fairy Tail was indebted to Twilight Ogre and it is not really in the guild's policy to steal money and to repay your debts. That's why the Fourth accepted their faith and punishment, and by doing so, he kept their losses at a minimum while keeping the guild alive as long as possible.