They wanted to get some benefits, yet were afraid of being tricked by empty promises.
The little abacuses in those nine Sect Leaders' hearts were all laid bare before Jiang Yuan's eyes—his System's appraisal window would pop up a line or two every now and then, and the corner of his eye could clearly catch every detail.
Taking all of the Ancient Ten Great Sects under his own banner was naturally a good thing.
Not to mention anything else, just having them "work" in the Divine Mountain to repair the city ruins, then having the city ruins and the Divine Mountain complement each other and nourish the Spiritual Energy cycle, that alone was a huge boon for the little courtyard.
After the contract, he'd have more enforcers who'd never betray him. If he wanted to conquer somewhere, wouldn't it just be a matter of saying the word? Setting things right would be much more convenient too!
