The first thing Sylas wanted to do was strengthen his personal army. Gogo, the Hollow Wing, and Nosphaleen needed to reach their full potential, and he needed to consider expanding them.
There was a point of diminishing returns when he did this. There wasn't exactly a hard cap on the number of Contracts he could have, but there was an implied cap.
The more powerful his Contracts were, and the more he had, the more stress there was on his Will to sustain that many.
It was fine if their loyalty was high like with Gogo and Nosphaleen, but if he had tried to claim a certain Azurex, for example, that would have been near impossible.
It had taken him a long time to gain the loyalty he had with Gogo and Nosphaleen. Gogo had originally hated his guts, and Nosphaleen relied on him out of necessity more than anything else.
If he wanted to rapidly expand his army, he obviously wouldn't be able to give them as much care.
