I think its because he always has higher priorities than browsing the net. Or may be he needs some information to take a decision or for something he needs to do later.

So he just puts it on a email queue. Later he can access that information from his mail box and take a look at that information.

Most important people, have better things to do than browsing site all day. Infact some people even ask me to mail them some stuff I tell them is interesting and then they go back to that at their convenience.