like sb as much for sth 中的 for 是表示缘由吗

However, after he got to know Hughie better, he liked him quite as much for his bright, cheerful spirits, and his generous, careless nature, and had asked him to come to his studio whenever he liked.

for在这是表示缘由的介词吗?

是的，这里的 for 表示缘由。