Concerned Parenting.

As a bastard of the Dyson family, he has some advantages over others in terms of influence. His identity means his death will be investigated. But his identity won't prevent him from being killed. 

It is smart not to rely on his identity to save his life, so he wants to wait and see the repercussions of his actions first. He also wants to grow stronger and gain more security in his personal strength before he starts burning one gold coin daily on charity. 

Besides, 10 silver coins per day is already close to his limit for now. With this daily rate, he will be spending around 37 gold coins per year on this. It is something that he can manage with his current liquid assets. 

But if he increases, it might put a burden on his finances. He doesn't want that. 

He would rather invest in his winery first and earn a lot of money before increasing the budget for his charity. That way he will be able to handle the increased expenditure on bread more easily.