Charity is a game whereby you salve your conscience.
He knew better than to expect that buying up debt contacts would make much difference. That wasn't the way the city worked. Many of those he freed of debt would still be stuck where they were, paying rent and trapped by the same structure that preyed on their human needs.
Yet it was his duty, and he did it gladly, despite that cynical whisper of futility. He didn't believe he could change the system -- not alone. He'd seen too many people get killed, or go mad, trying; his mother amongst them.
But maybe he could just free a few people from its clutches, and that would be enough, no?