in doing sth是什么句子成分

There is no advantage in going so early. 去那样早一点好处都没。

There may be some advantage in leaving here. 离开这里或许会有好处。

There is little advantage in buying so many books if you can’t read. 假如不识字，买这么多书就没什么用了。

请问这里的 in doing sth 是什么句子成分？

我认为，其中的 in doing sth 可剖析为方面状语，即“有用”限于在做某事方面。